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. The force of gravity was greater without water's buoying effect, selecting for well-muscled legs.
B. Eggs dry out in a terrestrial environment, selecting for the amniotic egg.
C. Additional oxygen was needed for larger muscles, selecting for the partially-divided heart and pulmonary circuit.
D. Gills tend to collapse out of the water, selecting for lungs and cutaneous respiration.
Answer: A
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