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

1. smaller animals have a higher metabolic rate.
2. small animals have a lower O₂ requirement.
3. the efficiency of muscles in large animals is less than in the small animals.
4. it is easier to carry a small body weight.

Correct answer: smaller animals have a higher metabolic rate.

Solution

Smaller animals generally have a higher metabolic rate per unit body mass, so they can supply energy more rapidly for strenuous activity like running uphill. This makes uphill locomotion easier for them than for larger animals.

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