A) endothermy.
B) their lack of teeth.
C) the presence of feathers.
D) the presence of a flight skeleton.
E) bipedalism.
Correct Answer
verified
Multiple Choice
A) efficient respiration.
B) efficient circulation.
C) endothermy.
D) auxiliary air sacs and hollow bones.
E) a three-chambered heart.
Correct Answer
verified
Multiple Choice
A) ectothermic.
B) poikilothermic.
C) endothermic.
D) heterothermic.
Correct Answer
verified
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