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It is much easier for a small animal to ...

It is much easier for a small animal to run uphill than for a large animal, because:

A

smaller animals have a higher metabolic rate

B

small animals have a lower `O_(2)` requirement.

C

the efficiency of muscles in large animals is less than in the small animals.

D

It is easier to carry a small body weight.

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The correct Answer is:
A
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