Answered: 23. Over several thousand years, some…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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23. Over several thousand years, some species of fish that live in pools in dark caves have lost functioning eyes. How might natural selection explain this loss? *

a. The loss is explained by the principle of “use and disuse”.

b. Natural selection cannot explain this loss, it only explains new innovations.

c. Gene flow from outside of the caves led to the loss.

d. In the dark, functioning eyes presented greater costs than benefits to the fish.

24. Engineers can design a limb on a robot that is much more versatile than those of any animal. Why are animal limbs not optimally arranged? *

a. Natural selection has not yet had sufficient time to make the optimal limb.

b. Natural selection is limited to modifying structures that were present in previous generations.

c. Too many different genes (each with many alleles) needed to produce a limb for natural selection to work.

d. Our current understanding of evolution can’t explain why animal limbs aren’t optimal.

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