SAT Subject Biology Practice Question 45: Answer and Explanation

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Question: 45

4. Which of these is a tetrapod that is NOT an amniote?

A. Ostrich
B. Shark
C. Rattlesnake
D. Salamander
E. Kangaroo

Correct Answer: D

Explanation:

Salamanders (along with frogs and snake-like caecilians) are tetrapods that lack water tight, amniotic eggs. Amphibians must lay their eggs in moist environments. Sharks are not tetrapods, and ostriches, rattlesnakes, and kangaroos are all amniotes. (Note that mammals are considered amniotes because they evolved from an ancestor with an amniotic egg.)

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