Question

mid-term exam
what is humus?
substance from decaying organic material
a type of worm that only lives in the soil
mineral matter or pieces of rock in the soil

Explanation:

Humus is formed from decomposed organic matter. The second option describes an earthworm, not humus. The third option refers to soil minerals, not humus. So, humus is a substance from decaying organic material.

Answer:

A. substance from decaying organic material