What is population variation?
a. variation between two adjacent populations
b. variation that results from two populations mixing and interbreeding
c. the distribution of phenotypes among individuals in a population
d. a gradient of change from one edge of a population to the other
c. the distribution of phenotypes among individuals in a population
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Abscisic acid synthesized in the root travels to different parts of the shoot where it regulates transpirational water loss. What is the most likely way that ABA travels from the root to the various locations within the shoot?
A. vessels and tracheids B. sieve tubes C. between cell walls D. from cell to cell through the plasmodesmata Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about transportation of materials within a plant? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
This enzyme will break down starch into smaller subunits
A) pepsin B) lipase C) amylase D) renin
In the section "Investigating Life: Size Matters in Fishing Frenzy", historically fishermen kept larger fish and left smaller juvenile fish. Over time the average size of the fish would
A. increase by natural selection. B. decrease by genetic drift. C. decrease by natural selection. D. increase by genetic drift. E. remain unchanged.
Smallpox was eliminated as a disease because of inoculations and the fact that
A. the alternate host was eradicated. B. the variola virus mutates infrequently. C. humans are the only known hosts. D. the variola virus causes rapid death.