The following effect of organic matter on soil is improved soil structure. The correct option is a.
What is organic matter?
Organic matter is a matter that has large carbon content. These are the matter present in the natural environment, and the natural things, like plants, and animals decaying matter.
Organic matter increases the nutrients of the soil, making it more fertile. It includes feces, leaves, plants, and animal's remain.
Thus, option a. improved soil structure is correct.
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