Biology · PYQ NEET UG 2016(1)

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

1. small animals have a lower \( \text{O}_2 \) requirement.
2. the efficiency of muscles in large animals is less than in the small animals.
3. smaller animals have a higher metabolic rate.
4. it is easier to carry a small body weight.