The answer is (D) because organic matter is broken down into carbon dioxide and the mineral forms of nutrients like nitrogen through the complicated process of decomposition. ... When considering the decomposition of leaves, (decomposers) like earthworms and other soil animals break the leaves into smaller pieces in a process called fragmentation.
Mary noticed that the leaves on her lawn are starting to break down. The process of breaking down or organic matter is called decomposition.
Decomposition is the break-down of organic matter into small matter by bacteria, or soil or water. Fungi and bacteria are known as natural decomposer.
Thus, the correct option is D, decomposition.
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