The invasion of the land by amphibians posed a number of challenges requiring evolutionary innovations. Which one of the following does not match a challenge with a corresponding adaptation found in amphibians?
A. Additional oxygen was needed for larger muscles, selecting for the partially divided heart and pulmonary circuit.
B. The force of gravity was greater without water's buoying effect, selecting for well-muscled legs.
C. Eggs dry out in a terrestrial environment, selecting for the amniotic egg.
D. Gills tend to collapse out of the water, selecting for lungs and cutaneous respiration.
Answer: C
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