Why does a 5 year old child need more energy than a teenager?

Because a 5 year old child can't take care of himself or herself. So, a 5 year old child needs more energy to fight with disease than a teenager. A teenager can take care of himself or herself to prevent him or her suffer from disease. Hence, small child needs more energy

Hope it helps

A dominant trait.

Explanation:

I learned this last year in Biology, and dominant traits ALWAYS rule over recessive traits.