Question

up about 25% each, and organic matter constitutes 5%, including humus and living organisms. this combination of biotic and abiotic factors makes soil an ecosystem. what contributes to the nature of soil as an ecosystem? the absence of living organisms combination of biotic and abiotic factors the lack of air and water in the soil

Explanation:

The text states that the combination of biotic (living organisms) and abiotic factors makes soil an ecosystem.

Answer:

B. combination of biotic and abiotic factors