Answer;
D.
Younger people generally have a slower metabolism than adults.
Explanation;
Basal metabolism is the amount of energy needed for sustaining life. It is the basic, or least, amount of energy the body needs to survive when at rest. It does not include additional energy required to support even a small amount of activity.
Basal metabolism is measured by the amount of calories burned when your body is inactive. Factors, such as, gender, heredity and age influence metabolism of an individual.
