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.
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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
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.
The first photosynthetic organisms to obtain hydrogen by splitting water were the cyanobacteria
______________ Indicate whether the statement is true or false.
Once inside the lymphatic system, tissue fluid is called ________.
Fill in the blank(s) with the appropriate word(s).