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li begins again (Figure 30.13). = 45 mm Hg. The pressure gradient drives CO2 out of tissue cells and into the capillaries. = 100 mm Hg, whereas the venous PCO2 = 100 mm Hg, but in the tissue cells, PO2 = 40 mm Hg and a PCO2 is lower PALVO 2 = 45 mm Hg. = 40 This OpenStax book is available for free at http://cnx.org/con... |
yers together as the lungs contract and relax. Pleurisy results when these layers of tissue become inflamed; it is painful because the inflammation increases the pressure within the thoracic cavity and reduces the volume of the lung. This OpenStax book is available for free at http://cnx.org/content/col12078/1.6 Chapte... |
is greater than perfusion, the arterioles dilate and the bronchioles constrict. This increases perfusion and reduces ventilation. Likewise, if ventilation is less than perfusion, the arterioles constrict and the bronchioles dilate to correct the imbalance. 1332 Chapter 30 | The Respiratory System Visit this site (http... |
CO2 + H2 O ↔ H2 CO3 (carbonic acid) ↔ HCO3 + H+ (bicarbonate) The benefit of the bicarbonate buffer system is that carbon dioxide is “soaked up” into the blood with little change to the pH of the system. This is important because it takes only a small change in the overall pH of the body for severe injury or death to ... |
he respiratory bronchioles, which house the first site of gas exchange. The respiratory bronchioles open into the alveolar ducts, alveolar sacs, and alveoli. Because there are so many alveoli and alveolar sacs in the lung, the surface area for gas exchange is very large. Several protective mechanisms are in place to pr... |
of air per breath decreases. If ventilation is low, the respiratory rate will increase while the volume of air per breath is decreased. If ventilation is high, the respiratory rate will increase while the volume of air per breath increases. If ventilation is low, the respiratory rate will increase while the volume of a... |
ient passage across their cell membrane more efficient due to the large size of the cell d. adaptations that allow the cell to take in larger food objects using the components of its cell membrane 33. In the past, the Earth has experienced environmental changes, which have changed the amount of available oxygen and car... |
hrough cells in the early evolution of animals to a complex network of blood vessels that reach all parts of the human body. This extensive network supplies the cells, tissues, and organs with oxygen and nutrients, and removes carbon dioxide and waste, which are byproducts of respiration. At the core of the human circu... |
blood between the different vertebrate groups due to adaptation during evolution and associated differences in anatomy. Figure 31.4 illustrates the basic circulatory systems of some vertebrates: fish, amphibians, reptiles, and mammals. This OpenStax book is available for free at http://cnx.org/content/col12078/1.6 Cha... |
called platelets. Blood plasma is actually the dominant component of blood and contains the water, proteins, electrolytes, lipids, and glucose. The cells are responsible for carrying the gases (red cells) and immune the response (white). The platelets are responsible for blood clotting. Interstitial fluid that surround... |
This OpenStax book is available for free at http://cnx.org/content/col12078/1.6 Chapter 31 | The Circulatory System 1359 Figure 31.8 (a) Platelets are formed from large cells called megakaryocytes. The megakaryocyte breaks up into thousands of fragments that become platelets. (b) Platelets are required for clotting of... |
presentations and models to analyze situations or solve problems qualitatively and quantitatively. 4.18 The student is able to use representations and models to analyze how cooperative interactions within organisms promote efficiency in the use of energy and matter. The heart is a complex muscle that pumps blood throug... |
g of cardiac muscle cells is regulated by the heart’s internal pacemaker that uses electrical signals to time the beating of the heart. The electrical signals and mechanical actions, illustrated in Figure 31.14, are intimately intertwined. The internal pacemaker starts at the sinoatrial (SA) node, which is located near... |
ds to the venules, veins, and finally to the main venae cavae, the rate of flow increases again but is still much slower than the initial rate in the aorta. Blood primarily moves in the veins by the rhythmic movement of smooth muscle in the vessel wall and by the action of the skeletal muscle as the body moves. Because... |
ar valve) one-way membranous flap between the atrium and the ventricle in the left side of the heart blood pressure (BP) pressure of blood in the arteries that helps to push blood through the body capillary smallest blood vessel that allows the passage of individual blood cells and the site of diffusion of oxygen and n... |
The student notices there are some notes on each jar, providing information on each animal’s classification. The student labels the unknown animals A-F and enters each animal’s circulatory system characteristics in a table. If the student wished to create a phylogeny of organisms A through F, which organism would like... |
s before the ventricles pump out the blood. 20. Compare and contrast veins and arteries. 1384 Chapter 31 | The Circulatory System a. Both veins and arteries have three distinct layers. 22. Veins take blood away from the heart and arteries bring blood back to the heart. b. Both veins and arteries have three distinct lay... |
reach all the parts of the body, it allows for more nutrient exchange. c. Because an elongated heart allows blood to easily return to the heart from a few points within the body cavity. d. Because an elongated heart allows blood to easily return to the heart from most points within the body cavity. 36. Insects have op... |
eloped ways to treat waste and maintain a balanced internal environment. (credit: modification of work by Redwin Law) Chapter Outline 32.1: Osmoregulation and Osmotic Balance 32.2: The Kidneys and Osmoregulatory Organs 32.3: Excretion Systems 32.4: Nitrogenous Wastes 32.5: Hormonal Control of Osmoregulatory Functions I... |
s are measured. The unit for measuring solutes is the mole. One mole is defined as the gram molecular weight of the solute. For example, the molecular weight of sodium chloride is 58.44. Thus, one mole of sodium chloride weighs 58.44 grams. The molarity of a solution is the number of moles of solute per liter of soluti... |
s promote efficiency in the use of energy and matter. Science Practice Learning Objective 1.4 The student can use representations and models to analyze situations or solve problems qualitatively and quantitatively. 4.18 The student is able to use representations and models to analyze how cooperation interactions within... |
the kidney tubules during tubular secretion, which is, in essence, the opposite process to tubular reabsorption. The collecting ducts collect filtrate coming from the nephrons and fuse in the medullary papillae. From here, the papillae deliver the filtrate, now called urine, into the minor calyces that eventually conne... |
idney stones, or renal failure. Nephrology is a subspecialty of internal medicine. To become a nephrologist, medical school is followed by additional training to become certified in internal medicine. An additional two or more years is spent specifically studying kidney disorders and their accompanying effects on the b... |
y course, an inquiry-based laboratory experience, instructional activities, and AP® exam questions. A learning objective merges required content with one or more of the seven science practices. Big Idea 2 Enduring Understanding 2.D Biological systems utilize free energy and molecular building blocks to grow, to reprodu... |
e processes and increases blood pressure Aldosterone Adrenal cortex Prevents loss of sodium and water Anti-diuretic hormone (vasopressin) Hypothalamus (stored in the posterior pituitary) Atrial natriuretic peptide Heart atrium Table 32.1 Prevents water loss Decreases blood pressure by acting as a vasodilator and increa... |
p://cnx.org/content/col12078/1.6 Chapter 32 | Osmotic Regulation and Excretion 1419 renal vein branch of a vein that exits the kidney and joins the inferior vena cava renin-angiotensin-aldosterone biochemical pathway that activates angiotensin II, which increases blood pressure segmental artery artery that branches fro... |
race the path of arteries and have similar names, except there are no segmental veins. c. Blood enters and exits the kidney at the renal hilum, and the renal blood supply starts with the branching of the aorta into the renal arteries. They end with the exiting of the renal veins to join the inferior vena cava. Each seg... |
xocytosis, in which the vacuoles merge with the cell membrane and expel wastes into the environment. 38. Describe the urea cycle. water impermeable, so the water flows from the filtrate to the interstitial fluid. Osmolality in the limb increases, and it is higher inside the loop than in the interstitial fluid. As the f... |
ne? Explain your answer in terms of the osmolarity of the water it lives in. a. The high osmolarity of the water would cause accumulation of too many salts in the body of the fish. b. The water it lives in has very low osmolarity, which causes water to constantly diffuse into the fish’s body. c. The water it lives in h... |
nle the distal convoluted tubule d. Bowman's capsule 61. Terrestrial arthropods, birds, and reptiles convert toxic ammonia to uric acid or the closely related compound guanine (guano). However, the conversion of ammonia to uric acid requires more energy and is much more complex than the conversion of ammonia to urea, o... |
lants and animals have a variety of chemical defenses against infections that affect dynamic homeostasis. Science Practice 1.1 The student can create representations and models of natural or man-made phenomena and systems in the domain. Science Practice 1.2 The student can describe representations and models of natural... |
m the blood. Without iron, certain pathogens, such as some bacteria, are unable to replicate; this is called nutritional immunity. Watch this 23-second stop-motion video (http://openstaxcollege.org/l/conidia) showing a neutrophil that searches for and engulfs fungus spores during an elapsed time of about 79 minutes. Ho... |
practices. 3.34 The student is able to construct explanations of cell communication through cell-to-cell direct contact or through chemical signaling. Essential Knowledge 3.D.2 Cells communicate with each other through direct contact with other cells or from a distance via chemical signaling. Science Practice Learning ... |
s of identical copies of one specific TCR variant on its cell surface. The specificity of the adaptive immune system occurs because it synthesizes millions of different T cell populations, each expressing a TCR that differs in its variable domain. This TCR This OpenStax book is available for free at http://cnx.org/cont... |
ucosal immune systems use many of the same cell types. Foreign particles that make their way to MALT are taken up by absorptive epithelial cells called M cells and delivered to APCs located directly below the mucosal tissue. M cells function in the transport described, 1454 Chapter 33 | The Immune System and are locate... |
accinologists are actively involved in developing new vaccines that are applied via intranasal, aerosol, oral, or transcutaneous (absorbed through the skin) delivery methods. Importantly, mucosal-administered vaccines elicit both mucosal and systemic immunity and produce the same level of disease resistance as injected... |
act to form the binding site through which an antibody can bind a specific epitope on an antigen. The numbers of repeated constant domains in Ig classes are the same for all antibodies corresponding to a specific class. Antibodies are structurally similar to the extracellular component of the BCRs, and B cell maturatio... |
ed organs, the immune system is responding to unmatched MHC proteins on the cells of the donated (“non-self”) organ. However, the immune system usually responds as it should, defending you against infection and getting you back to your AP® Biology class as soon as possible. Information presented and the examples highli... |
ation, gene expression, and cell trafficking to effect immune responses cytotoxic T lymphocyte (CTL) adaptive immune cell that directly kills infected cells via perforin and granzymes, and releases cytokines to enhance the immune response dendritic cell immune cell that processes antigen material and presents it on the... |
a. Natural killer cells are not always present in the a. acquired immunity body and must be induced, whereas macrophages are constantly present. b. Natural killer cells actually kill foreign cells, whereas macrophages serve only a signaling function. c. Only macrophages can invade host tissues to fight foreign cells t... |
of transplanted cells. Other host cells will join to phagocytize the foreign cells. 32. Suppose a person was born without the ability to produce MHC I molecules. What problem would that create? a. A person without the ability to produce MHC I molecules would die immediately. b. A person without the ability to produce M... |
source: AP Biology Course and Exam Description Fall 2012, p. 132] 1480 Chapter 33 | The Immune System a. Natural killer cells recognize MHC I on a healthy cell and do not kill it, while the infected cells that do not present MHC I are killed. b. Natural killer cells recognize MHC I on an infected cell and kill it, whil... |
56. The diagram shows the normal feedback loop that controls the production of thyroid hormones in the human body. Graves’ disease is an autoimmune disease in which the body produces autoantibodies to the TSH receptor. When these autoantibodies bind to the receptor, it mimics the action of the TSH hormone. How would th... |
Learning Objectives listed in the Curriculum Framework provide a transparent foundation for the AP® Biology course, an inquiry-based laboratory experience, instructional activities, and AP® exam questions. A learning objective merges required content with one or more of the seven science practices. Big Idea 3 Enduring ... |
ermined in mammalian species? a. genetics b. nutrition c. temperature d. genetics and temperature 34.2 | Fertilization In this section, you will explore the following questions: • What are the differences between internal and external methods of fertilization? • What are examples of methods animals use for development ... |
rratives, as to how DNA in chromosomes is transmitted to the next generation via mitosis, or meiosis followed by fertilization. Essential Knowledge 3.A.2 In eukaryotes, heritable information is passed to the next generation via processes that include the cell cycle and mitosis or meiosis plus fertilization. Science Pra... |
mucus; lubricate vagina Breast Ovaries Table 34.2 External Produce and deliver milk Internal Carry and develop eggs This OpenStax book is available for free at http://cnx.org/content/col12078/1.6 Chapter 34 | Animal Reproduction and Development 1501 Female Reproductive Anatomy Organ Location Function Oviducts (Fallopia... |
s are regulated by the interaction of hormones from the hypothalamus and anterior pituitary with hormones from reproductive tissues and organs. Detailed knowledge about sperm production and the ovarian and menstrual cycles is not within the scope for AP®, and you likely studied this information in a health class. Since... |
Which of the following statements about the menstrual cycle is TRUE? a. Estrogen levels rise during the luteal phase of the ovarian cycle and the secretory phase of the uterine cycle. b. Menstruation occurs much before LH and FSH levels peak. c. Menstruation occurs after progesterone levels rise. d. Progesterone level... |
go to maximize the possibility of resistance to disease? The genetic engineering of a human child, the production of "designer babies" with desirable phenotypic characteristics, was once a topic restricted to science fiction. This is the case no longer: science fiction is now overlapping into science fact. Many phenoty... |
form, the ball of cells still retains its spherical shape. However, animal bodies have lateral-medial (left-right), dorsal-ventral (back-belly), and anterior-posterior (head-feet) axes, illustrated in Figure 34.27. Figure 34.27 Animal bodies have three axes for symmetry. (credit: modification of work by NOAA) How are ... |
maintain labor. An alternative to labor and delivery is the surgical delivery of the baby through a procedure called a Caesarian section. This is major abdominal surgery and can lead to post-surgical complications for the mother, but in some cases it may be the only way to safely deliver the baby. The mother’s mammary... |
f nausea neural tube tube-like structure that forms from the ectoderm and gives rise to the brain and spinal cord oogenesis process of producing haploid eggs organogenesis process of organ formation ovarian cycle cycle of preparation of egg for ovulation and the conversion of the follicle to the corpus luteum oviduct (... |
sects, worms, and mollusks, is useful for _____. a. b. spermatogenesis sperm motility c. growth of embryos a. 1 b. 2 c. 3 d. 4 18. Which of the following events activate the germ cells at puberty to produce spermatozoa? a. activation by gonadotropin-releasing hormone b. activation by increased hair growth c. d. increas... |
whereas in mammals, the presence of the penis and vagina allows direct delivery. Insects always use parthenogenesis. 49. Explain the fate of the newly released secondary oocyte after ovulation. a. b. c. d. If it fuses with a sperm, the resulting zygote enters the cervix for implantation. If it is not fertilized, it wi... |
nd the baby is expelled from the uterus. The last stage is the passage of the placenta after the baby has been born. b. During stage one, the cervix thins and is dilated to about 10 cm. During stage two, the baby is expelled from the uterus. The last stage is the passage of the placenta after the baby has been born. c.... |
metrium and the start of the menstrual cycle. b. After the release of the egg from the follicle, the corpus luteum is formed, which inhibits FSH and LH production, which then inhibits GnRH production, causing no other follicle to develop. When no fertilization takes place, the corpus luteum degenerates and the progeste... |
ir interactions possess complex properties. Interactions within biological systems lead to complex properties. Essential Knowledge 4.A.6 Interactions among living organisms and with their environment results in the movement of matter and energy. Science Practice Learning Objective 1.4 The student can use representation... |
logy selected. Ecologists should also have a broad background in the physical sciences, as well as a sound foundation in mathematics and statistics. Figure 35.5 This landscape ecologist is releasing a black-footed ferret into its native habitat as part of a study. (credit: USFWS Mountain Prairie Region, NPS) This OpenS... |
rt solar energy into the chemical energy needed by all living things. Light availability can be an important force directly affecting the evolution of adaptations in photosynthesizers. For instance, plants in the understory of a temperate forest are shaded when the trees above them in the canopy completely leaf out in ... |
c nutrients, such as nitrogen and phosphorus, are important in the distribution and the abundance of living things. Plants obtain these inorganic nutrients from the soil when water moves into the plant through the roots. Therefore, soil structure (particle size of soil components), soil pH, and soil nutrient content pl... |
layer of trees rises above this understory and is topped by a closed upper canopy—the uppermost overhead layer of branches and leaves. Some additional trees emerge through this closed upper canopy. These layers provide diverse and complex habitats for the variety of plants, fungi, animals, and other organisms within th... |
lements of the layered forest structure seen in tropical wet forests. The structure of a boreal forest is often only a tree layer and a ground layer (Figure 35.19). When conifer needles are dropped, they decompose more slowly than broad leaves; therefore, fewer nutrients are returned to the soil to fuel plant growth. T... |
Within the oceanic zone there is thermal stratification where warm and cold waters mix because of ocean currents. Abundant plankton serve as the base of the food chain for larger animals such as whales and dolphins. Nutrients are scarce and this is a relatively less productive part of the marine biome. When photosynth... |
ing in estuaries, such as the mangroves pictured here, must be able to tolerate a wide variation of salinity. (credit: Moni3, Wikimedia Commons) The spring and fall turnovers are important processes in freshwater lakes that act to move nutrients and water from the bottom to the top. Explain how this is different in tem... |
lar region (for example, a very cool week in June in central Indiana) is evidence of global climate change. However, a cold week in June is a weather-related event and not a climate-related one. These misconceptions often arise because of confusion over the terms climate and weather. Climate refers to the long-term, pr... |
en atmospheric concentrations of carbon dioxide and temperature: as carbon dioxide rises, global temperature rises. Since 1950, the concentration of atmospheric carbon dioxide has increased from about 280 ppm to 382 ppm in 2006. In 2011, the atmospheric carbon dioxide concentration was 392 ppm. However, the planet woul... |
cryptofauna invertebrates found within the calcium carbonate substrate of coral reefs ecology study of interaction between living things and their environment ecosystem services human benefits and services provided by natural ecosystems emergent vegetation wetland plants that are rooted in the soil but have portions o... |
ize organic compounds they obtain from decaying heterotrophs. b. can use carbon dioxide and sunlight and synthesize their own food. c. use wind energy to synthesize organic compounds. d. synthesize inorganic compounds from organic compounds. 7. The study of population ecology focuses on ___. a. The number of individual... |
be studied in an organism or population more easily. Community and ecosystem ecology might be more difficult for collaboration. It is easier to study community and population ecology as the effect of biotic and abiotic factors can be studied in easily in a community or population more easily. Organismal and ecosystem e... |
rich in nutrients, which promote regrowth. Subtropical deserts are characterized by their high precipitation and water-retaining plants. b. Shrubs dominate chaparral vegetation and are well adapted to the periodic fires in the area. Ashes left behind after fires are rich in nutrients, which promote regrowth. Subtropica... |
elease of large amounts of methane, accelerating global warming. Investing in mining of earth minerals and metal ores could be the alternative. 1588 Chapter 35 | Ecology and the Biosphere TEST PREP FOR AP® COURSES 58. The Karner blue butterfly has been declared an endangered species. It is dependent on wild lupine for ... |
ly rhinoceros and the giant deer disappeared, has long been debated. Did we hunt these creatures to extinction? By examining all available DNA evidence, Cooper et al. (Science, 349, 2015) have compared time extinction intervals with these oscillations of climate as shown in the table. Chapter 35 | Ecology and the Biosp... |
t insurance rates. In fact, while the term “demographics” is commonly used when discussing humans, all living populations can be studied using this approach. 1596 Chapter 36 | Population and Community Ecology Population Size and Density The study of any population usually begins by determining how many individuals of a... |
interval, and their life expectancy at each interval. An example of a life table is shown in Table 36.1 from a study of Dall mountain sheep, a species native to northwestern North America. Notice that the population is divided into age intervals (column A). The mortality rate (per 1000), shown in column D, is based on ... |
makes sense that these offspring have some ability to be able to move within their environment and find food and perhaps shelter. Even with these abilities, their small size makes them extremely vulnerable to predation, so the production of many offspring allows enough of them to survive to maintain the species. Anima... |
t It Why is long-term parental care not associated with having many offspring during a reproductive episode? Section Summary All species have evolved a pattern of living, called a life history strategy, in which they partition energy for growth, maintenance, and reproduction. These patterns evolve through natural selec... |
his model also allows for the population of a negative population growth, or a population decline. This occurs when the number of individuals in the population exceeds the carrying capacity (because the value of (K-N)/K is negative). A graph of this equation yields an S-shaped curve (Figure 36.9), and it is a more real... |
nsactions of the Royal Society of Tropical Medicine and Hygiene 76, no. 2 (1982): 187-197, doi:10.1016/0035-9203(82)90272-3. 4. Martin Walker et al., “Density-Dependent Effects on the Weight of Female Ascaris lumbricoides Infections of Humans and its Impact on Patterns of Egg Production.” Parasites & Vectors 2, no. 11 ... |
ted species Characteristics of K-selected species Characteristics of r-selected species Mature late Greater longevity Increased parental care Increased competition Fewer offspring Larger offspring Table 36.2 Mature early Lower longevity Decreased parental care Decreased competition More offspring Smaller offspring 1616... |
the ability of infectious disease to limit human population growth. In the past, diseases such as the bubonic plaque of the fourteenth century killed between 30 and 60 percent of Europe’s population and reduced the overall world population by as many as 100 million people. Today, the threat of infectious disease, while... |
enduring understandings and/or big ideas. 2.23 The student is able to design a plan for collecting data to show that all biological systems are affected by complex biotic and abiotic interactions. 2.D.1 All biological systems from cells and organisms to populations, communities and ecosystems are affected by complex bi... |
a harmless species mimics the coloration of a harmful species, as is seen with the (a) bumblebee and (b) bee-like robber fly. (credit a, b: modification of work by Cory Zanker) (a) (b) This OpenStax book is available for free at http://cnx.org/content/col12078/1.6 Chapter 36 | Population and Community Ecology 1627 In M... |
es Abundance Biodiversity describes a community’s biological complexity: it is measured by the number of different species (species richness) in a particular area and their relative abundance (species evenness). The area in question could be a habitat, a biome, or the entire biosphere. Species richness is the term that... |
energy resource: sunlight. Their height gave them access to sunlight while also shading the ground and other low-lying species. After the fire, though, these trees are no longer dominant. Thus, the first plants to grow back are usually annual plants followed within a few years by quickly growing and spreading grasses ... |
cted movement in response to a stimulus. Orthokinesis is the increased or decreased speed of movement of an organism in response to a stimulus. Woodlice, for example, increase their speed of movement when exposed to high or low temperatures. This movement, although random, increases the probability that the insect spen... |
to have a broken wing. It is exhibiting an altruistic behavior as in saving its fledgling; it is increasing its own fitness along with the fitness of the young bird. d. Parent creates distraction by being more aggressive and showing its willingness to fight. It is exhibiting an altruistic behavior by saving its fledgli... |
g that might compete with her own, so she actively interferes with the male’s signaling to attract other mates. 1644 Chapter 36 | Population and Community Ecology Polygynous mating refers to one male mating with multiple females. In these situations, the female must be responsible for most of the parental care as the s... |
unity Ecology 1647 read, they can make mental images of objects or organisms and imagine changes to them, or behaviors by them, and anticipate the consequences. In addition to visual processing, cognitive learning is also enhanced by remembering past experiences, touching physical objects, hearing sounds, tasting food,... |
tion of parents by newborns as the first organism they see after birth innate behavior instinctual behavior that is not altered by changes in the environment intersexual selection selection of a desirable mate of the opposite sex interspecific competition competition between species for resources in a shared habitat or... |
ion. a. For various age groups, count the number of individuals that died and the number that survived within a defined time period. b. For various age groups, count the number of individuals that were born and the number that died within a defined time period. c. For each sex, count the number of individuals that were... |
n to an animal species classified as a Batesian mimic if it did not have its mimicry attributes. a. The animal species would suffer increased loss through predation because its predators would not learn to avoid eating it. b. The animal species would suffer decreased loss through predation because it still produces har... |
usual stimulus. In operant conditioning, the animal does not learn a new behavior in response to a stimulus, whereas in classical conditioning, the animal learns to associate a non-voluntary behavior with an unusual stimulus. In operant conditioning, the animal learns to associate a voluntary behavior with its conseque... |
reas other species would decline in number in such a climate. c. Plant species that are drought-resistant would decline in cold temperatures whereas other species would thrive in number in such a climate. d. Plant species that are drought-resistant would thrive in warm temperatures whereas other species would decline i... |
or free at http://cnx.org/content/col12078/1.6 Chapter 36 | Population and Community Ecology 1665 a. The lizards on the island with no predators will likely evolve adaptations such as camouflaged coloration, sharp spines, or toxins to defend against this predator. These adaptations will likely be absent in the other po... |
ov demonstrated classical conditioning through a maze running experiment with the dog. The motivation for the dog to work its way through the maze was a piece of food at the end of the maze. The dog ran in one trial per day and had food available at the end of the run. b. Pavlov hung a chicken piece in a cage too high ... |
t with these data. a. When energy availability is low, females put more energy than normal into producing offspring. b. When energy availability is high, females produce offspring with higher viability. c. When energy availability is low, females shift energy away from reproduction and toward their own survival. d. Whe... |
offered dull individuals and brightly colored individuals to see if the predators show a preference. d. Run laboratory tests in which predators familiar with the dull colored non-poisonous snake are offered poisonous brightly colored individuals and non-poisonous brightly colored individuals to see if the predators sho... |
number of birds attacking butterflies with and without eyespots suggests that the presence of an eyespot makes butterflies more visible to predators resulting in selection against the trait. c. Comparison of the number of birds fleeing from butterflies with and without eyespots indicates that the eyespot trait has been... |
ckly away from predator threats. In schools, fish swim in a coordinated pattern without moving chaotically and bumping into one another. Which type of communication between individuals could account for the precisely coordinated movements of all of the fish in a school in response to a threat? a. aural signals b. phero... |
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