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their mechanical properties. = = tissue culture = = in many cases, creation of functional tissues and biological structures in vitro requires extensive culturing to promote survival, growth and inducement of functionality. in general, the basic requirements of cells must be maintained in culture, which include... | B) the conditions of the fox's habitat |
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polyatomic ions that do not split up during acid – base reactions are hydroxide ( oh− ) and phosphate ( po43− ). plasma is composed of gaseous matter that has been completely ionized, usually through high temperature. = = = acidity and basicity = = = a substance can often be classified as an acid or a base. th... | A) a chemical reaction |
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stems mainly provide support to the leaves and reproductive structures, but can store water in succulent plants such as cacti, food as in potato tubers, or reproduce vegetatively as in the stolons of strawberry plants or in the process of layering. leaves gather sunlight and carry out photosynthesis. large, fl... | A) flower |
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prominent functional groups that can be found in organisms : amino group, carboxyl group, carbonyl group, hydroxyl group, phosphate group, and sulfhydryl group. in 1953, the miller – urey experiment showed that organic compounds could be synthesized abiotically within a closed system mimicking the conditions o... | A) cell |
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participates as a consumer, resource, or both in consumer – resource interactions, which form the core of food chains or food webs. there are different trophic levels within any food web, with the lowest level being the primary producers ( or autotrophs ) such as plants and algae that convert energy and inorga... | B) They break down dead organic matter. |
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on biological causation and the diversity of life. he made countless observations of nature, especially the habits and attributes of plants and animals on lesbos, classified more than 540 animal species, and dissected at least 50. aristotle ' s writings profoundly influenced subsequent islamic and european sch... | A) claiming Earth is in orbit about the Sun. |
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##physical processes which take place in human beings as they make sense of information received through the visual system. the subject of the image. when developing an imaging system, designers must consider the observables associated with the subjects which will be imaged. these observables generally take th... | B) visible light |
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tissue engineering is a biomedical engineering discipline that uses a combination of cells, engineering, materials methods, and suitable biochemical and physicochemical factors to restore, maintain, improve, or replace different types of biological tissues. tissue engineering often involves the use of cells pl... | D) neuron |
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##lling, pipe jacking and other operations. a caisson is sunk by self - weight, concrete or water ballast placed on top, or by hydraulic jacks. the leading edge ( or cutting shoe ) of the caisson is sloped out at a sharp angle to aid sinking in a vertical manner ; it is usually made of steel. the shoe is gener... | D) Only the water will evaporate and the salt will remain in the container. |
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use less energy than conventional thermal separation processes such as distillation, sublimation or crystallization. the separation process is purely physical and both fractions ( permeate and retentate ) can be obtained as useful products. cold separation using membrane technology is widely used in the food t... | D) allowing the water to evaporate |
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what if someone built a " box " that applies quantum superposition not just to quantum bits in the microscopic but also to macroscopic everyday " objects ", such as schr \ " odinger ' s cat or a human being? if that were possible, and if the different " copies " of a man could exploit quantum interference to s... | B) Smell the boxes. |
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is further subdivided into two broad categories : chemical metallurgy and physical metallurgy. chemical metallurgy is chiefly concerned with the reduction and oxidation of metals, and the chemical performance of metals. subjects of study in chemical metallurgy include mineral processing, the extraction of meta... | A) conducts heat, magnetic, solid |
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torsion oscillations of the neutron star crust are landau damped by the alfven continuum in the bulk. for strong magnetic fields ( in magnetars ), undamped alfven eigenmodes appear.
the magnetization of superconducting samples is influenced by their porosity. in addition to structural modifications and improve... | A) iron nail |
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= = = = = = environmental remediation = = = environmental remediation is the process through which contaminants or pollutants in soil, water and other media are removed to improve environmental quality. the main focus is the reduction of hazardous substances within the environment. some of the areas involved i... | C) cutting down a rain forest |
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and still use the same basic biological methods. in brewing, malted grains ( containing enzymes ) convert starch from grains into sugar and then adding specific yeasts to produce beer. in this process, carbohydrates in the grains broke down into alcohols, such as ethanol. later, other cultures produced the pro... | D) chemical changes. |
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. most cells are very small, with diameters ranging from 1 to 100 micrometers and are therefore only visible under a light or electron microscope. there are generally two types of cells : eukaryotic cells, which contain a nucleus, and prokaryotic cells, which do not. prokaryotes are single - celled organisms s... | A) a tissue. |
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the walls of a victim ' s stomach. toxicology, a subfield of forensic chemistry, focuses on detecting and identifying drugs, poisons, and other toxic substances in biological samples. forensic toxicologists work on cases involving drug overdoses, poisoning, and substance abuse. their work is critical in determ... | A) Notify the teacher. |
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the infrared excess around the white dwarf g29 - 38 can be explained by emission from an opaque flat ring of dust with an inner radius 0. 14 of the radius of the sun and an outer radius approximately equal to the sun ' s. this ring lies within the roche region of the white dwarf where an asteroid could have be... | A) Earth and the Sun. |
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an important question of theoretical physics is whether sound is able to propagate in vacuums at all and if this is the case, then it must lead to the reinterpretation of one zero - restmass particle which corresponds to vacuum - sound waves. taking the electron - neutrino as the corresponding particle, its ob... | B) 128 Hz |
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outer satellites of the planets have distant, eccentric orbits that can be highly inclined or even retrograde relative to the equatorial planes of their planets. these irregular orbits cannot have formed by circumplanetary accretion and are likely products of early capture from heliocentric orbit. the irregula... | B) the Sun's gravity |
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is said to have occurred. a chemical reaction is therefore a concept related to the " reaction " of a substance when it comes in close contact with another, whether as a mixture or a solution ; exposure to some form of energy, or both. it results in some energy exchange between the constituents of the reaction... | D) rusting of an iron chain |
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becomes quite gentle. accordingly, in large basins, rivers in most cases begin as torrents with a variable flow, and end as gently flowing rivers with a comparatively regular discharge. the irregular flow of rivers throughout their course forms one of the main difficulties in devising works for mitigating inun... | C) erodes rock in its path. |
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the recent report on laser cooling of liquid may contradict the law of energy conservation.
assertions made in a document recently deposited in the arxiv are refuted.
i reject the following null hypothesis : { h0 : your data are normal }. such drastic decision is motivated by theoretical reasons, and applies t... | C) They can take millions of years to form. |
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living things, computers, societies, and even books are part of a grand evolutionary struggle to survive. that struggle shapes nature, nations, religions, art, science, and you. what you think, feel, and do is determined by it. darwinian evolution does not apply solely to the genes that are stored in dna. usin... | B) A moose eats a plant. |
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learning to use math in physics involves combining ( blending ) our everyday experiences and the conceptual ideas of physics with symbolic mathematical representations. graphs are one of the best ways to learn to build the blend. they are a mathematical representation that builds on visual recognition to creat... | A) energy. |
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##morphology studies the origin of landscapes. structural geology studies the deformation of rocks to produce mountains and lowlands. resource geology studies how energy resources can be obtained from minerals. environmental geology studies how pollution and contaminants affect soil and rock. mineralogy is the... | B) a fault |
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three major planets, venus, earth, and mercury formed out of the solar nebula. a fourth planetesimal, theia, also formed near earth where it collided in a giant impact, rebounding as the planet mars. during this impact earth lost $ { \ approx } 4 $ \ % of its crust and mantle that is now is found on mars and t... | B) the mass of Earth. |
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##morphology studies the origin of landscapes. structural geology studies the deformation of rocks to produce mountains and lowlands. resource geology studies how energy resources can be obtained from minerals. environmental geology studies how pollution and contaminants affect soil and rock. mineralogy is the... | C) sedimentary |
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##morphology studies the origin of landscapes. structural geology studies the deformation of rocks to produce mountains and lowlands. resource geology studies how energy resources can be obtained from minerals. environmental geology studies how pollution and contaminants affect soil and rock. mineralogy is the... | A) history and processes of Earth. |
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three of what is called the six simple machines, from which all machines are based. these machines are the inclined plane, the wedge, and the lever, which allowed the ancient egyptians to move millions of limestone blocks which weighed approximately 3. 5 tons ( 7, 000 lbs. ) each into place to create structure... | C) a pulley |
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oxygen, carbon dioxide, and water to pass through while restricting the movement of larger molecules and charged particles such as ions. cell membranes also contain membrane proteins, including integral membrane proteins that go across the membrane serving as membrane transporters, and peripheral proteins that... | C) membrane |
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the transition of our energy system to renewable energies is necessary in order not to heat up the climate any further and to achieve climate neutrality. the use of wind energy plays an important role in this transition in germany. but how much wind energy can be used and what are the possible consequences for... | C) wood. |
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##morphology studies the origin of landscapes. structural geology studies the deformation of rocks to produce mountains and lowlands. resource geology studies how energy resources can be obtained from minerals. environmental geology studies how pollution and contaminants affect soil and rock. mineralogy is the... | A) magma cooling |
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= = = = = = environmental remediation = = = environmental remediation is the process through which contaminants or pollutants in soil, water and other media are removed to improve environmental quality. the main focus is the reduction of hazardous substances within the environment. some of the areas involved i... | B) any substance that is harmful to the environment |
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##ting the principle of conservation of mass and developing a new system of chemical nomenclature used to this day. english scientist john dalton proposed the modern theory of atoms ; that all substances are composed of indivisible ' atoms ' of matter and that different atoms have varying atomic weights. the d... | C) structure of the atoms of the elements. |
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##aggeration to say that the tip of the radicle.. acts like the brain of one of the lower animals.. directing the several movements ". about the same time, the role of auxins ( from the greek auxein, to grow ) in control of plant growth was first outlined by the dutch scientist frits went. the first known auxi... | D) endocrine |
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this extra strength allows some structural components to fail without bridge collapse. the extra strength used in the design is called the margin of safety. eyes and ears provide working examples of passive redundancy. vision loss in one eye does not cause blindness but depth perception is impaired. hearing lo... | A) the sensory neurons in the ears |
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in mathematics, a reflection ( also spelled reflexion ) is a mapping from a euclidean space to itself that is an isometry with a hyperplane as the set of fixed points ; this set is called the axis ( in dimension 2 ) or plane ( in dimension 3 ) of reflection. the image of a figure by a reflection is its mirror ... | B) reflects |
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is collected and processed to extract valuable metals. ore bodies often contain more than one valuable metal. tailings of a previous process may be used as a feed in another process to extract a secondary product from the original ore. additionally, a concentrate may contain more than one valuable metal. that ... | A) the evaporation of seawater |
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this is an experimentalist ' s list of questions concerning the physics of the charmed baryon sector which have no satisfactory answer.
three separate questions of relevance to major league baseball are investigated from a physics perspective. first, can a baseball be hit farther with a corked bat? second, is ... | C) Do crickets chirp more during the day or at night? |
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oil umbrella ) ; for calculating the time of death ( allowing for weather and insect activity ) ; described how to wash and examine the dead body to ascertain the reason for death. at that time the book had described methods for distinguishing between suicide and faked suicide. he wrote the book on forensics s... | C) bacteria |
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becomes quite gentle. accordingly, in large basins, rivers in most cases begin as torrents with a variable flow, and end as gently flowing rivers with a comparatively regular discharge. the irregular flow of rivers throughout their course forms one of the main difficulties in devising works for mitigating inun... | D) melt |
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background : african swine fever is among the most devastating viral diseases of pigs. despite nearly a century of research, there is still no safe and effective vaccine available. the current situation is that either vaccines are safe but not effective, or they are effective but not safe. findings : the asf v... | A) Vaccines help prevent illnesses. |
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( division of the nucleus ) is preceded by the s stage of interphase ( during which the dna is replicated ) and is often followed by telophase and cytokinesis ; which divides the cytoplasm, organelles and cell membrane of one cell into two new cells containing roughly equal shares of these cellular components.... | D) forms new cells. |
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chloroplasts make are used for many things, such as providing material to build cell membranes out of and making the polymer cutin which is found in the plant cuticle that protects land plants from drying out. plants synthesise a number of unique polymers like the polysaccharide molecules cellulose, pectin and... | D) The new material can save money on replacements. |
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##morphology studies the origin of landscapes. structural geology studies the deformation of rocks to produce mountains and lowlands. resource geology studies how energy resources can be obtained from minerals. environmental geology studies how pollution and contaminants affect soil and rock. mineralogy is the... | D) tectonic plates collided |
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an important question of theoretical physics is whether sound is able to propagate in vacuums at all and if this is the case, then it must lead to the reinterpretation of one zero - restmass particle which corresponds to vacuum - sound waves. taking the electron - neutrino as the corresponding particle, its ob... | C) a vibration |
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to dye denim and the artist ' s pigments gamboge and rose madder. sugar, starch, cotton, linen, hemp, some types of rope, wood and particle boards, papyrus and paper, vegetable oils, wax, and natural rubber are examples of commercially important materials made from plant tissues or their secondary products. ch... | D) wood that is sturdy |
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of measuring methods. x - rays and gamma rays are used in industrial radiography to make images of the inside of solid products, as a means of nondestructive testing and inspection. the piece to be radiographed is placed between the source and a photographic film in a cassette. after a certain exposure time, t... | A) hair |
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often injurious, at least with the plants on which i experimented. " an important adaptive benefit of outcrossing is that it allows the masking of deleterious mutations in the genome of progeny. this beneficial effect is also known as hybrid vigor or heterosis. once outcrossing is established, subsequent switc... | C) genetic mutation |
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becomes quite gentle. accordingly, in large basins, rivers in most cases begin as torrents with a variable flow, and end as gently flowing rivers with a comparatively regular discharge. the irregular flow of rivers throughout their course forms one of the main difficulties in devising works for mitigating inun... | C) sleet |
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charges in the nuclei and the negative charges oscillating about them. more than simple attraction and repulsion, the energies and distributions characterize the availability of an electron to bond to another atom. the chemical bond can be a covalent bond, an ionic bond, a hydrogen bond or just because of van ... | C) concentrated in the center of the model. |
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several thoughts are presented on the long ongoing difficulties both students and academics face related to calculus 101. some of these thoughts may have a more general interest.
in a voltaic cell, positive ( negative ) ions flow from the low ( high ) potential electrode to the high ( low ) potential electrode... | D) magnetic field produced by the electric current. |
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significantly greater strength and fracture toughness. another major change in the body during the firing or sintering process will be the establishment of the polycrystalline nature of the solid. significant grain growth tends to occur during sintering, with this growth depending on temperature and duration o... | B) temperature. |
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in a voltaic cell, positive ( negative ) ions flow from the low ( high ) potential electrode to the high ( low ) potential electrode, driven by an ` electromotive force ' which points in opposite direction and overcomes the electric force. similarly in a superconductor charge flows in direction opposite to tha... | D) electric fan |
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; that is, more amenable to chemical reactions. the phase of a substance is invariably determined by its energy and the energy of its surroundings. when the intermolecular forces of a substance are such that the energy of the surroundings is not sufficient to overcome them, it occurs in a more ordered phase li... | A) liquid becomes a gas |
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liver glycogen. during recovery, when oxygen becomes available, nad + attaches to hydrogen from lactate to form atp. in yeast, the waste products are ethanol and carbon dioxide. this type of fermentation is known as alcoholic or ethanol fermentation. the atp generated in this process is made by substrate - lev... | D) using the sun to make food |
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the walls of a victim ' s stomach. toxicology, a subfield of forensic chemistry, focuses on detecting and identifying drugs, poisons, and other toxic substances in biological samples. forensic toxicologists work on cases involving drug overdoses, poisoning, and substance abuse. their work is critical in determ... | B) variables. |
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by ancestry rather than superficial characteristics. while scientists do not always agree on how to classify organisms, molecular phylogenetics, which uses dna sequences as data, has driven many recent revisions along evolutionary lines and is likely to continue to do so. the dominant classification system is ... | B) The organisms are in the same phylum. |
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oxygen ion migration in li2mno3 was systematically studied by first - principles calculations. hole polaron is found effective to lower the migration barrier of oxygen ion.
##s ( sometimes called pressurized caissons ), which penetrate soft mud, are bottomless boxes sealed at the top and filled with compressed... | B) The atmosphere is less dense at higher elevations so there is less oxygen available. |
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systems are responsible for operational controls such as the throttle, brake and steering controls ; as well as many comfort - and - convenience systems such as the hvac, infotainment, and lighting systems. it would not be possible for automobiles to meet modern safety and fuel - economy requirements without e... | A) vehicle 1 |
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intense research in the materials science community due to the unique properties that they exhibit. nanostructure deals with objects and structures that are in the 1 – 100 nm range. in many materials, atoms or molecules agglomerate to form objects at the nanoscale. this causes many interesting electrical, magn... | C) centimeter (cm) |
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substrate - level phosphorylation, which does not require oxygen. = = = photosynthesis = = = photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organism ' s metabolic activities via cellular respiration. this chemic... | D) Plants take in carbon dioxide and release oxygen. |
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eat them. plants and other photosynthetic organisms are at the base of most food chains because they use the energy from the sun and nutrients from the soil and atmosphere, converting them into a form that can be used by animals. this is what ecologists call the first trophic level. the modern forms of the maj... | B) Mendel |
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cellular and molecular biology of cereals, grasses and monocots generally. model plants such as arabidopsis thaliana are used for studying the molecular biology of plant cells and the chloroplast. ideally, these organisms have small genomes that are well known or completely sequenced, small stature and short g... | C) Change only the soil type in each container. |
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two local macros are included ( gothic. sty and fleqn. sty )
other contemporary production centre. the earliest documented use of lead ( possibly native or smelted ) in the near east dates from the 6th millennium bc, is from the late neolithic settlements of yarim tepe and arpachiyah in iraq. the artifacts sug... | C) dissolved minerals |
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on biological causation and the diversity of life. he made countless observations of nature, especially the habits and attributes of plants and animals on lesbos, classified more than 540 animal species, and dissected at least 50. aristotle ' s writings profoundly influenced subsequent islamic and european sch... | D) curiosity |
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the origin of the martian moons deimos and phobos is controversial. one hypothesis for their origin is that they are captured asteroids, but the mechanism requires an extremely dense martian atmosphere, and the mechanism by which an asteroid in solar orbit could shed sufficient orbital energy to be captured in... | B) The Moon reflects the light from the Sun. |
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becomes quite gentle. accordingly, in large basins, rivers in most cases begin as torrents with a variable flow, and end as gently flowing rivers with a comparatively regular discharge. the irregular flow of rivers throughout their course forms one of the main difficulties in devising works for mitigating inun... | B) ocean trade winds |
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, or prescribe pharmaceutical drugs or other therapies. differential diagnosis methods help to rule out conditions based on the information provided. during the encounter, properly informing the patient of all relevant facts is an important part of the relationship and the development of trust. the medical enc... | C) at a physicians' conference. |
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i state some open problems coming from joint work with paul erd \ h { o } s
this is an experimentalist ' s list of questions concerning the physics of the charmed baryon sector which have no satisfactory answer.
here are a few random thoughts on the interpretations of the quantum double slit experiment, the ma... | B) Do corn plants grow better in sandy soil or in clay soil? |
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##ctonics, mountain ranges, volcanoes, and earthquakes are geological phenomena that can be explained in terms of physical and chemical processes in the earth ' s crust. beneath the earth ' s crust lies the mantle which is heated by the radioactive decay of heavy elements. the mantle is not quite solid and con... | A) ocean trench |
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, fungi ( mycology ) – including lichen - forming fungi ( lichenology ), non - chlorophyte algae ( phycology ), and viruses ( virology ). however, attention is still given to these groups by botanists, and fungi ( including lichens ) and photosynthetic protists are usually covered in introductory botany course... | B) It will begin the process of building soil. |
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to rna to protein. there are two gene expression processes : transcription ( dna to rna ) and translation ( rna to protein ). = = = gene regulation = = = the regulation of gene expression by environmental factors and during different stages of development can occur at each step of the process such as transcrip... | A) a codon |
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the origin of the martian moons deimos and phobos is controversial. one hypothesis for their origin is that they are captured asteroids, but the mechanism requires an extremely dense martian atmosphere, and the mechanism by which an asteroid in solar orbit could shed sufficient orbital energy to be captured in... | B) moon |
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; however, a successful large - scale industrial application of the process was the development of continuous freeze drying of coffee. high - temperature short time processing – these processes, for the most part, are characterized by rapid heating and cooling, holding for a short time at a relatively high tem... | B) Heat it. |
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##ctonics, mountain ranges, volcanoes, and earthquakes are geological phenomena that can be explained in terms of physical and chemical processes in the earth ' s crust. beneath the earth ' s crust lies the mantle which is heated by the radioactive decay of heavy elements. the mantle is not quite solid and con... | B) volcanoes |
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background : african swine fever is among the most devastating viral diseases of pigs. despite nearly a century of research, there is still no safe and effective vaccine available. the current situation is that either vaccines are safe but not effective, or they are effective but not safe. findings : the asf v... | A) worldwide vaccination for smallpox |
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. microbial mats of coexisting bacteria and archaea were the dominant form of life in the early archean eon and many of the major steps in early evolution are thought to have taken place in this environment. the earliest evidence of eukaryotes dates from 1. 85 billion years ago, and while they may have been pr... | A) a forest fire |
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by reference to undefined terms : the subject in which we never know what we are talking about, nor whether what we are saying is true. bertrand russell 1901 many other attempts to characterize mathematics have led to humor or poetic prose : a mathematician is a blind man in a dark room looking for a black cat... | A) a prism |
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weather than in the winter months, so that the rivers fall to their low stage in the summer and are liable to be in flood in the winter. in fact, with a temperate climate, the year may be divided into a warm and a cold season, extending from may to october and from november to april in the northern hemisphere ... | A) layers of fat |
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kingdom ; phylum ( or division ) ; class ; order ; family ; genus ( plural genera ) ; species. the scientific name of a plant represents its genus and its species within the genus, resulting in a single worldwide name for each organism. for example, the tiger lily is lilium columbianum. lilium is the genus, an... | A) can produce fertile offspring. |
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or removed from the dna during programmed stages of development of the plant, and are responsible, for example, for the differences between anthers, petals and normal leaves, despite the fact that they all have the same underlying genetic code. epigenetic changes may be temporary or may remain through successi... | C) several identical plant seeds. |
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has rest mass and volume ( it takes up space ) and is made up of particles. the particles that make up matter have rest mass as well – not all particles have rest mass, such as the photon. matter can be a pure chemical substance or a mixture of substances. = = = = atom = = = = the atom is the basic unit of che... | D) water |
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the walls of a victim ' s stomach. toxicology, a subfield of forensic chemistry, focuses on detecting and identifying drugs, poisons, and other toxic substances in biological samples. forensic toxicologists work on cases involving drug overdoses, poisoning, and substance abuse. their work is critical in determ... | C) The classroom would have good ventilation. |
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prehistory. the oldest gold treasure in the world, dating from 4, 600 bc to 4, 200 bc, was discovered at the site. the gold piece dating from 4, 500 bc, found in 2019 in durankulak, near varna is another important example. other signs of early metals are found from the third millennium bc in palmela, portugal,... | A) igneous intrusion |
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ability of cells to receive, process, and transmit signals with its environment and with itself. signals can be non - chemical such as light, electrical impulses, and heat, or chemical signals ( or ligands ) that interact with receptors, which can be found embedded in the cell membrane of another cell or locat... | B) nerve cells |
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10 kgy most food, which is ( with regard to warming ) physically equivalent to water, would warm by only about 2. 5 °c ( 4. 5 °f ). the specialty of processing food by ionizing radiation is the fact, that the energy density per atomic transition is very high, it can cleave molecules and induce ionization ( hen... | D) liquid to gas. |
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##g mills. wet mixing generally involves the same equipment. forming is making the mixed material into shapes, ranging from toilet bowls to spark plug insulators. forming can involve : ( 1 ) extrusion, such as extruding " slugs " to make bricks, ( 2 ) pressing to make shaped parts, ( 3 ) slip casting, as in ma... | B) They all cause vibrations. |
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liver glycogen. during recovery, when oxygen becomes available, nad + attaches to hydrogen from lactate to form atp. in yeast, the waste products are ethanol and carbon dioxide. this type of fermentation is known as alcoholic or ethanol fermentation. the atp generated in this process is made by substrate - lev... | A) A rubber band that is being stretched |
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was used before copper smelting was known. copper smelting is believed to have originated when the technology of pottery kilns allowed sufficiently high temperatures. the concentration of various elements such as arsenic increase with depth in copper ore deposits and smelting of these ores yields arsenical bro... | B) solid |
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protist cells ), there are two distinct types of cell division : mitosis and meiosis. mitosis is part of the cell cycle, in which replicated chromosomes are separated into two new nuclei. cell division gives rise to genetically identical cells in which the total number of chromosomes is maintained. in general,... | C) crossing over. |
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##aggeration to say that the tip of the radicle.. acts like the brain of one of the lower animals.. directing the several movements ". about the same time, the role of auxins ( from the greek auxein, to grow ) in control of plant growth was first outlined by the dutch scientist frits went. the first known auxi... | A) by spreading the seed |
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pigment chlorophyll a. chlorophyll a ( as well as its plant and green algal - specific cousin chlorophyll b ) absorbs light in the blue - violet and orange / red parts of the spectrum while reflecting and transmitting the green light that we see as the characteristic colour of these organisms. the energy in th... | A) leaf |
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which could be used as tools, primarily in the form of choppers or scrapers. these tools greatly aided the early humans in their hunter - gatherer lifestyle to perform a variety of tasks including butchering carcasses ( and breaking bones to get at the marrow ) ; chopping wood ; cracking open nuts ; skinning a... | D) a magnifying glass |
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##tronics, the science of using mechanical devices with human muscular, musculoskeletal, and nervous systems to assist or enhance motor control lost by trauma, disease, or defect. prostheses are typically used to replace parts lost by injury ( traumatic ) or missing from birth ( congenital ) or to supplement d... | C) nervous |
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the belief that three dimensional space is infinite and flat in the absence of matter is a canon of physics that has been in place since the time of newton. the assumption that space is flat at infinity has guided several modern physical theories. but what do we actually know to support this belief? a simple a... | B) flipping the coin twenty more times |
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which constitutes anywhere from 30 % [ m / m ] to 90 % [ m / m ] of its composition by volume, yielding an array of materials with interesting thermomechanical properties. in the processing of glass - ceramics, molten glass is cooled down gradually before reheating and annealing. in this heat treatment the gla... | B) quartz |
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it is well known and well established by scientific observation that a free neutron radioactively decays into a proton plus an electron plus an anti - neutrino with a mean life time before decay of about 900 seconds. that established fact conflicts sharply with the hypothesis that the neutron is composed of tw... | C) positively charged and part of the nucleus |
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. nuclear weapons are considered weapons of mass destruction, and their use and control has been a major aspect of international policy since their debut. the design of a nuclear weapon is more complicated than it might seem. such a weapon must hold one or more subcritical fissile masses stable for deployment,... | D) neutrons. |
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