Question

what is the usable form of carbon?​

Answer 1

Answer:

Carbides ........ I think ,

Answer 2

Answer:

Carbon that is used by producers, consumers and decomposers cycles fairly rapidly through air, water and biota. But carbon can also be stored as biomass in the roots of trees and other organic matter for many decades. This carbon is released back into the atmosphere by decomposition, as was noted before.