Why do exaptations provide challenges to evolutionary biologists in their attempt to generate testable hy-potheses about how natural selection produces adaptations?

What will be an ideal response?


ANS:
Will vary, but should include the difficulty—or impossibility—of tying the increased frequency of the adap-tive trait in a population over evolutionary history to the environmental condition to which the trait currently offers advantage.

Biology & Microbiology

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Recent evidence suggests that most microbial communities have many individuals representing at least ________ taxa.

A. 1,000 B. 1,000,000,000 C. 10,000,000 D. 100,000

Biology & Microbiology

Which of the following statements is not true of multifactorial traits?

1.They are controlled by multiple genes. 2.They can be impacted by the environment. 3.They exhibit a bell-shaped curve. 4.All of these statements are true.

Biology & Microbiology

The first photosynthetic organisms to obtain hydrogen by splitting water were the cyanobacteria

______________ Indicate whether the statement is true or false.

Biology & Microbiology

Once inside the lymphatic system, tissue fluid is called ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology