It's A. Primary succession :) because Human economics and ecology are linked together because human economics utilizes the ecosystem and the natural resources in older for economics to actually exist. :)))))))
Answer:
C. top soil has more organic matter.
Explanation:
It's more fertile than subsoil, due to having more organic matter and because fertilizers are usually added to the topsoil only.
73130-26, S62.323A, W51.XXXA, Y93.61 that should help.
<span>Soils rich in organic material are always highly fertile.</span>
