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Birds are different from reptiles in all of the following features except


A) endothermy.
B) their lack of teeth.
C) the presence of feathers.
D) the presence of a flight skeleton.
E) bipedalism.

F) All of the above
G) A) and D)

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The changes that were necessary to cope with the heavy energy demands of flight in birds include all of the following except


A) efficient respiration.
B) efficient circulation.
C) endothermy.
D) auxiliary air sacs and hollow bones.
E) a three-chambered heart.

F) A) and C)
G) A) and B)

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Birds,like mammals,can regulate their body temperatures within close limits.Therefore birds and mammals are called


A) ectothermic.
B) poikilothermic.
C) endothermic.
D) heterothermic.

E) A) and B)
F) A) and C)

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