Which of the following statements correct identifies the term “humus”?

a.

humus is the organic material found in soil that results from plants and animals that die and decay.

c.

humus is precipitation that contains a high concentration of pollutants.

b.
humus is the groundwater that is not replenished by rain.
d.
humus is a means of water transportation that involves the relocation of ground water to the surface.