What is the cycling of nutrients between the ground and living organisms?

a) when nutrients from the ground are taken by living organism and returned when those organisms die and decompose.
b) when fertilizer is added to the soil by humans.
c) when planted deplete the soil of all its nutrients and can no longer grow there.
d) when limited numbers of living organisms are available to weather rock and contribute organic matter.

What is the cycling of nutrients between the ground and living organisms?

A) When nutrients from the ground are taken by living organism and returned when those organisms die and decompose.

B) When fertilizer is added to the soil by humans.

C) When planted deplete the soil of all its nutrients and can no longer grow there.

D) When limited numbers of living organisms are available to weahter rock and contribute organic matter.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.

i think the answer is a.keratin is the pigment responsible for skin color.