Decomposition is the process by which break(s) down over time.
a. soil, sand, and rocks
b. dead plants and animals
c. mountains
d. natural gas

The correct answer is - b. dead plants and animals.

The decomposition is a process that appears only in the organic matter, thus the animals and the plants. Once the animals and the plants die, they start to decompose. The decomposition is triggered by the bacteria, which manages to decompose almost of the organic matter, apart from the bones.

Through this process, the dead animals and plants contribute to the natural fertilization of the soil, because that is the material from which the uppermost, fertile, humus layer of the soils is formed.

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.