SAT Subject Biology Practice Question 470: Answer and Explanation

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Question: 470

20. Situation 1: A species of moth is preyed on by bats. Over hundreds and hundreds of years, the moths develop a sophisticated pattern of flying when they hear the screech of a bat. This helps them escape danger. Other changes occur as well, and when an attempt is made to mate the current moth with its ancestor moth, no viable eggs are produced.

Situation 2: A species of frogs is living in a pond near an earthquake fault line. A sizable earthquake separates the frog population into two separate populations. After hundreds and hundreds of years, the two groups are unable to mate.

If the earthquake in Situation 2 left one group of frogs without a water source, would the frogs be able to survive and reproduce?

A. No, frogs are amphibians and can live only in water.
B. No, frog eggs must be laid in water because they lack a shell.
C. Yes, because amphibians frogs can live on both land and water.
D. Yes, frogs have a thick scaly skin, which protects them from dehydration.
E. Yes, the frogs would quickly adapt to the new environment.

Correct Answer: B

Explanation:

B One of the main issues that separates frogs from reptiles is that reptile eggs have a shell that prevents them from dehydrating and can therefore live away from a water source. Be careful of tempting, correct-sounding answer choices! The first part of choice A is true; frogs are amphibians, but that means they can live both in water and land. Choice C is true, but doesn't address the issue of reproduction. Choice D is false; frogs lack the scaly skin of reptiles, which is why they need to be around water, and choice E is unlikely. Maybe over a long period of time the frogs could adapt, but switching from a partially aquatic to a completely terrestrial lifestyle would require many significant changes and would take a very long time.

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