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trees that lose their leaves during winter are called **blank**
[ "fruits", "fungus", "coniferous" ]
deciduous
Gametogenesis , the production of sperm and eggs , takes place through the process of **blank**
[ "mutations", "gametes", "osmosis" ]
meiosis
the name of the roundworms digestive organ is **blank**
[ "intestine", "tube", "stomach" ]
gut
Oxides contain one or two metal elements combined with **blank**
[ "nitrogen", "carbon", "ethanol" ]
oxygen
**blank** of evolution happens when two species evolve the same traits
[ "divergent", "associated", "multiplicative" ]
convergent
What increases **blank** a muscle like a biceps is extended
[ "weight", "speed", "momentum" ]
force
Hot magma beneath the surface mixes with water and forms **blank**
[ "hydrocarbons", "liquids", "lava" ]
gas
electrical force have **blank** of attraction
[ "similar", "neutral", "positive" ]
negative
The different types of nuclei are referred to as **blank**
[ "organelles", "atoms", "rhizomes" ]
nuclides
**blank** has the least amount of energy in an atom
[ "crystals", "protons", "rings" ]
electrons
the visible surface of the sun is called **blank**
[ "chronosphere", "stratosphere", "ionosphere" ]
photosphere
Wind or water that travels toward the poles from the equator curves in **blank** direction
[ "west", "downward", "upward" ]
east
**blank** is defined as the ability to cause changes in matter
[ "pressure", "fuel", "transcription" ]
energy
plants use **blank** to make food for themselves and most other organisms
[ "heat", "electricity", "gravity" ]
light
**blank** measures atmospheric pressure and can be used as an altimeter
[ "thermometer", "speedometer", "indicator" ]
barometer
solid-solid solutions like brass and bronze are called **blank**
[ "oxides", "mixtures", "amalgams" ]
alloys
the main element in organic compounds is **blank**
[ "oxygen", "helium", "hydrogen" ]
carbon
Desertification can result from slash-and-burn agriculture , which causes loss of **blank**
[ "fertilizer", "subsoil", "sediment" ]
topsoil
Cancers are caused by a series of **blank**
[ "adaptations", "parasites", "microbes" ]
mutations
**blank** is defined as the preserved remains or traces of organisms that lived during earlier ages
[ "taxidermy", "archaeology", "deposits" ]
fossils
Reduction often involves the gain of hydrogen , the loss of oxygen , or the gain of **blank**
[ "mass", "protons", "neutrons" ]
electrons
the moon 's shadow 's inner part is called **blank**
[ "mullah", "penumbra", "aurora" ]
umbra
Each parapodium has numerous chaetae , bristles made of **blank**
[ "ricin", "lectin", "casein" ]
chitin
**blank** includes sponges , which are aquatic invertebrates
[ "chordata", "mollusca", "hymenoptera" ]
porifera
**blank** has the highest electronegativity value
[ "chlorine", "magnesium", "Barium" ]
fluorine
When small particles , such as clay and silt , are in mixed in water but do not disolve in the water , **blank** state are they in
[ "mud", "incomplete", "sedimentation" ]
suspension
When a person stands on the floor , his feet exert **blank** on the surface
[ "acceleration", "power", "resistance" ]
pressure
Molds that grow on bread are from **blank** kingdom
[ "animal", "yeast", "pollen" ]
fungi
The frequency of sound waves is measured in **blank** , or the number of waves that pass a fixed point in a second
[ "avis", "Ohms", "watts" ]
hertz
In a position-time graph , **blank** does the slope of the line represent
[ "position", "time", "direction" ]
velocity
Salmon must do **blank** when they migrate from freshwater to the ocean
[ "regenerate", "adapt", "synthesize" ]
acclimatize
**blank** occurs when two free radicals come in contact with each other
[ "assimilation", "radiation", "cancellation" ]
termination
Despite the season , **blank** aspect of constellations never change
[ "colors", "size", "location" ]
patterns
the members of the clade vertebrata is known as **blank**
[ "invertebrates", "grasses", "lipids" ]
vertebrates
**blank** helps maglev trains go very fast
[ "rollers", "wheels", "gravity" ]
magnets
A glacier is an example of h20 in **blank** state of matter
[ "stable", "liquid", "gas" ]
solid
Fires , mainly caused by **blank** , are a natural disturbance in temperate grasslands
[ "campfires", "humans", "cigarettes" ]
lightning
Nucleic acids are found in all living cells and also **blank**
[ "parasites", "fungi", "bacteria" ]
viruses
Mollusks can be divided into **blank** many classes
[ "four", "nine", "three" ]
seven
the term for a partial degradation of glucose without the use of oxygen is **blank**
[ "segregation", "condensation", "oxidation" ]
fermentation
Ground collapse , associated with chambers of **blank** substance , leads to formation of a caldera
[ "molten", "stone", "lava" ]
magma
the process by which rocks and other sediments are picked up by a glacier is **blank**
[ "pulling", "freezing", "picking" ]
plucking
Genetic variation produced in sexual life cycles contributes to **blank** process
[ "deconstruction", "maturity", "generation" ]
evolution
Cellular innate defenses in vertebrates also involve natural killer **blank**
[ "nerves", "proteins", "lipids" ]
cells
**blank** involves people quickly finding destinations using polar coordinates
[ "patterning", "sticking", "mapping" ]
orienteering
**blank** in biotechnology means a genetically exact copy of an organism
[ "adult", "male", "phenotype" ]
clone
Vertebrata are characterized by the presence of **blank**
[ "Bones", "Muscles", "Thumbs" ]
backbone
the height above or below sea level is called **blank**
[ "depth", "latitude", "variation" ]
elevation
dominant in temperate forests is **blank** of tree
[ "vines", "fungus", "shrubs" ]
deciduous
**blank** are by far the most common type of invertebrate
[ "spiders", "crustaceans", "corals" ]
insects
**blank** means the amount of water vapor in the air
[ "temperature", "pressure", "ambient" ]
humidity
**blank** happens when mammals raise their hair with tiny muscles in the skin
[ "bleeding", "balding", "bruising" ]
goosebumps
Upon death of an organism , during composition , **blank** returns to the soil as ammonium ions
[ "potasium", "calcium", "hydrogen" ]
nitrogen
Digestion of proteins begins with acids in **blank** organ
[ "colon", "liver", "brain" ]
stomach
the most abundant metal of the earth 's crust is **blank**
[ "calcium", "copper", "magnetite" ]
aluminum
**blank** of the eye allows light to enter
[ "eyelid", "retina", "iris" ]
pupil
**blank** of muscle regulates air flow in lungs
[ "vascular", "striated", "alveoli" ]
smooth
The temperature at which a substance melts is called its **blank** point
[ "boiling", "change", "freezing" ]
melting
Humans are among the most versatile of mammals with **blank** type of diet
[ "carnivore", "herbivore", "vegetarian" ]
omnivore
**blank** is required to move or change matter from one state to another
[ "food", "gravity", "evolution" ]
energy
**blank** contains positive protons and neutral neutrons
[ "electrons", "ions", "epidermis" ]
nucleus
**blank** control the amount of water , ions , and other substances in the blood by excreting more or less of them in urine
[ "lungs", "tongue", "ears" ]
kidneys
fungi which feed on living cells are called **blank**
[ "static", "predatory", "symbiotic" ]
parasitic
**blank** offers the richest source of fossils
[ "metamorphic", "igneous", "geode" ]
sedimentary
Isotopes are named for their number of protons plus **blank**
[ "isomers", "electrons", "nuclei" ]
neutrons
In phyisics , **blank** is considered to be the rotational version of force
[ "work", "energy", "pressure" ]
torque
Skeletal muscles are attached to the skeleton by tough connective tissues called **blank**
[ "fibers", "veins", "cords" ]
tendons
the ability to see called is **blank**
[ "thought", "smell", "hearing" ]
vision
Water can be broken down into hydrogen and oxygen gases by the addition of **blank**
[ "motion", "mineral", "demand" ]
energy
**blank** is shared by all chordates
[ "isochord", "botachord", "laxchord" ]
notochord
The lithosphere is divided into a dozen major and several minor **blank**
[ "zones", "crystals", "faults" ]
plates
**blank** are used to indicate the number of atoms of an element that are in the compound
[ "indices", "suffixes", "digits" ]
prefixes
Anything moving has **blank** type of energy
[ "magnetic", "potential", "thermal" ]
kinetic
the adaptation that certain animals use to become less visible to predators and prey is **blank**
[ "skeletons", "speed", "insulation" ]
camouflage
another term for blood clotting is **blank**
[ "adulation", "oxidation", "differentiation" ]
coagulation
**blank** occurs when the cell cycle is no longer regulated
[ "allergy", "schizophrenia", "malnutrition" ]
cancer
Nerve cells that sense touch are found mainly **blank**
[ "stomach", "brain", "lungs" ]
skin
women should perform a breast self-exam by **blank**
[ "yearly", "weekly", "quarterly" ]
monthly
a fiber that is found only in mammals is **blank**
[ "muscle", "muscle", "feathers" ]
hair
**blank** when secondary alcohols oxidize
[ "chromosomes", "ions", "electrons" ]
ketones
Bones , cartilage , and **blank** other thing make up the skeletal system
[ "muscles", "organs", "lungs" ]
ligaments
**blank** of the sperm contains the nucleus
[ "body", "tail", "nucleus" ]
head
the smallest structural and functional unit of all living organisms are **blank**
[ "neutrons", "lipids", "proteins" ]
cells
Somatic cells come from the body and are not **blank** , like sperm or eggs are
[ "spores", "toxins", "organic" ]
gametes
**blank** opens two strands of dna
[ "replication", "adenylate", "chromosome" ]
helicase
Most hybrids are sterile because **blank** genetic structures are not homologous and can not pair during meiosis
[ "zygotes", "ribosomes", "phenotypes" ]
chromosomes
Vultures , raccoons and blowflies are examples of **blank**
[ "producer", "predator", "consumer" ]
scavengers
**blank** takes blood to the brain
[ "veins", "pulmonary", "coronary" ]
carotid
The bohr model works only for **blank** atom
[ "helium", "carbon", "boron" ]
hydrogen
**blank** has a higher metabolic rate , a mouse or an elephant
[ "rat", "rabbit", "elephant" ]
mouse
the energy produced **blank** by plants come from
[ "groundwater", "animals", "evaporation" ]
sunlight
The ionic end of a detergent can either be a sulfate or **blank**
[ "molecule", "calcite", "phosphate" ]
sulfonate
**blank** is thought to have evolved from theropod dinosaurs around 150 million years ago
[ "insects", "mammals", "reptiles" ]
birds
the protein in red blood cells which transports oxygen around the body is **blank**
[ "plasma", "hydrogen", "hematocrit" ]
hemoglobin
At a synapse , **blank** objects are released to carry a nerve impulse from one neuron to the next
[ "viruses", "receptors", "microorganisms" ]
neurotransmitters
All cells have a jellylike substance in which subcellular components are suspended . **blank** is that substance
[ "glycerol", "plasma", "cortisol" ]
cytosol
the term for the force that brings objects toward the earth is **blank**
[ "weight", "light", "centrifugal" ]
gravity
When your brain senses that your body temperature is increasing , it sends messages to the blood vessels in the skin to increase in **blank**
[ "surface", "height", "weight" ]
diameter
Ingestion and propulsion are the first two steps in **blank** process that describes how humans process and consume food
[ "absorption", "regeneration", "respiration" ]
digestion
a round sucker has used **blank** to suck the blood of other fish
[ "shark", "abalone", "moray" ]
lamprey