Why does the biosphere require carbon atoms to be recycled?

Carbon is the basic unit of life as we know that all life is based on carbon. all Basic macro molecules and bio molecules which are very important for life contain Carbon in different forms, So it is important for the nutrients to be recycled due to increase amount of requirement.

Explanation:

Carbon is utilized in the form of carbon and return to the atmosphere in the form of carbon dioxide. Carbon atom utilized in the biosphere after passing through different systems and recycled to atmosphere