The answer could possibly be natural selection or survival of the fittest
Decomposers eat dead remains of organisms that are quaternary consumer (no one eats them while alive). So, they break these down and therefore turn into nutrients in the soil for plants to use.
Answer:
the answer is C
Animals get the nitrogen they need by eating plants or other animals that contain nitrogen. When organisms die, their bodies decompose bringing the nitrogen into soil on land or into ocean water. Bacteria alter the nitrogen into a form that plants are able to use