Which of these is an accurate comparison between birds and mammals?
A) Birds are cold-blooded; mammals are warm-blooded.
B) Birds are egg laying; no mammals lay eggs.
C) Birds have air sacs in addition to lungs; mammals have no air sacs.
D) Birds lack a septum between the ventricles; mammals have a septum between the ventricles.
E) Birds, unlike mammals, require no parental care.

Question

Quizplus · Accepted Answer

Birds have a unique respiratory system that includes air sacs in addition to lungs, which helps them with efficient gas exchange. Mammals do not have air sacs.

Which of These Is an Accurate Comparison Between Birds and Mammals