Why Has Natural Selection Favored the Evolution of Double Circulation

question 8

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

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