There is a limit to how small a warm-blooded animal can be. A mammal or bird that weighted only two and a half grams would starve to death. It would burn up its food too rapidly and would not be able to eat fast enough to supply more fuel.
63.Warm-blooded animals maintain a steady temperature by ________.
A.regulating the amount of heat produced
B.storing heat in their body cells
C.controlling the amount of heat given off
D.constantly replacing lost surface heat
64.The speed at which an animal lives is determined by measuring __________.
A.the amount of food it eats
B.the rate at which it uses oxygen
C.the amount of oxygen it uses D.its body temperature
65.The amount of oxygen an animal uses depends on _________.
A.its body weight
B.the food it eats
C.its general size and shape D.the length of time it lives
66.Form the selection, we can infer that __________.
A.the hummingbird lives faster than any other warm-blooded creature
B.there is no limit as to how large a warm-blooded animal can be.
C.small animals have less skin for their body weight than large ones .
D.the hummingbird is the smallest animal in the world.
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