Why are calories needed ?

Your body needs calories for energy. But eating too many calories — and not burning enough of them off through activity — can lead to weight gain. Most foods and drinks contain calories.

cognitive activities are mental processes through which we make sense of the world around us or get to know or experience our environment (internal and external). examples of cognitive activities are reasoning, thinking, perceiving, decision-making, listening, observing,etc.

steady state because it the only on that maes sense