How do autotrophs and heterotrophs relate to the carbon cycle?

Autotrophs store chemical energy in carbohydrate food molecules they build themselves. Most autotrophs make their food through photosynthesis using the energy of the sun. Heterotrophs cannot make their own food, so they must eat or absorb it.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).