Sound waves enter the ear through the ____
a. cochlea
b. auditory canal
c. tympanic membrane
d. round window
e. auditory nerve
ANSWER: b
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The end of the Permian period was characterized by a mass extinction of
A) shallow-water marine invertebrates. B) dinosaurs and other large reptiles. C) small mammals. D) large mammals.
Among mammals, the male and female genital structures that consist mostly of erectile tissue include the _____
A) penis and clitoris B) vas deferens and oviduct C) testes and ovaries D) prostate and ovaries
The mate-attracting elaborate plumage of the male peacock is a result of:
A) genetic drift. B) adaptation to the environment. C) gene flow. D) sexual selection.