D. what is the general term for organisms that live in soil and fallen leaves on the forest floor? what is one example of them?

The general term is microorganisms and an example of them are fungi.

Explanation:

Microorganisms are small living beings whose dimensions do not allow them to be observed with the naked eye by man. Thus, they can only be viewed under the microscope. Many microorganisms live in soil and fallen leaves on the forest floor. In general, microorganisms contribute to soil fertilization, substance recycling and participate in biogeochemical cycles. They can still be used in the manufacture of products such as yogurt, wines, cheese, vinegars and breads.

One exemplo of a microorganism is fungi. Soil fungi are also capable of interacting with plants, with pathogenic and mycorrhizal associations being the most significant interactions in agroecology.

your answer would be a, maximum exploitation of resources.