Why do mammals require more extensive respiratory surface,?

1.	Why do mammals require more extensive respiratory surface,?
Answer» Mammals require\xa0an\xa0extensive respiratory surface\xa0because we have high energy requirements.Unlike fishes, reptiles and amphibians, we are warm blooded and maintain a constant body temperature, and this does\xa0take energy.Compared to reptiles we use\xa0more\xa0oxygen because we need it to convert food into body heat.

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