Multiple Choice
Why has natural selection favored the evolution of double circulation in birds and mammals?
A) because they are larger than reptiles and amphibians
B) because they use more energy than equivalent-size reptiles and amphibians
C) because they have more viscous blood than reptiles and amphibians
D) because they cannot obtain as much oxygen from the air as reptiles and amphibians
Correct Answer:
Verified
Correct Answer:
Verified
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