Decomposers are necessary in an ecosystem because they 0 A. produce food for plants by the process of photosynthesis.
B. Povide energy for plants.
C. Make nutrients available to plants through the process of decay
D. Can rapidly reproduce and evolve. .

C .

Explanation:

They perform a valuable service as Earth's cleanup crew. Without decomposers, dead leaves, dead insects, and dead animals would pile up everywhere. Imagine what the world would look like! More importantly, decomposers make vital nutrients available to an ecosystem's primary producers—usually plants and algae.

a covalent bond, specfically triple bond