Which of the following amphibians has no legs, even in reproductively mature adults?
a) salamanders
b) frogs
c) caecilians
d) snakes
e) none of the above
Answer: c) caecilians
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Malpighian tubules are found in ____
a. annelids b. mammals c. flatworms d. insects e. reptiles
Which of the following, if successful, always results in a complete cessation of trade in a certain product?
a. an import quota b. an embargo c. a trading bloc d. a voluntary restraint agreement
Mutations can create new alleles that
A. are beneficial to the organism's fitness. B. have no effect on the fitness of the organism. C. decrease the fitness of the organism. D. All of the choices are correct.
The rapid diversification of species seen in the fossil record followed by long periods of stasis is part of the ________ model of evolution
A) punctuated equilibrium B) symmetric C) spatial D) graduated