Avery active person uses a large amount of energy and therefore has a high
a temperature
b cholesterol level
c fat diet
d metabolism

The correct answer is option D, that is, metabolism.  

Metabolism is a term used to signify mainly towards the dissociation of food and its succeeding conversion into energy required by an individual's body. It is something, which comprises both anabolism and catabolism that are the buildup and breakdown of components.  

The procedure by which the body transforms what one eats into energy is known as metabolism. At the time of this complex biochemical phenomenon, the calories in beverages and food are amalgamated with oxygen to discharge the energy one requires to work. Therefore, a person having a high amount of energy will have a high metabolism.  

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

c should be the answer