Why Has Natural Selection Favored the Evolution of Double Circulation

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-sized 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

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