What term describes the amount of energy a body needs at rest for basic functions?

Basal/resting metabolism is described as the basic energy that should be present while rest so the proper functioning of body can be maintained.

Explanation: Basal metabolism is the rate of calories that should be present  while the particular person is at rest so that afterwards the functioning of body parts can be normal. This is the important factor for the body to maintain its supportive nature. If the metabolism in the body increases , then there is the increase in the basal metabolism rate as well.