Which of these is a proper contrast between birds and mammals?

a) Birds, unlike mammals, require no parental care.
b) Birds have air sacs in addition to lungs; mammals have no air sacs.
c) Birds are egg laying; no mammals lay eggs.
d) Birds are ectothermic; mammals are endothermic.


Answer: b) Birds have air sacs in addition to lungs; mammals have no air sacs.

Biology & Microbiology

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