The carbon cycle ensures that carbon is not lost. which is another important benefit of the carbon cycle?

A benefit of the carbon cycle is that it is critical to the food chain. The carbon cycle is important to all ecosystems as well as the food chain.

Carbon is an important element in living tissues and in all organic matter. All living things are made of carbon.

Plants use carbon from carbon dioxide gas in the atmosphere to make their own food and to grow. The carbon becomes part of the plant. Plants are  consumed by animals. Thus the carbon cycle plays a vital role in the food chain. 

the answer is c on e2020, bud.