How are the nitrogen and carbon cycles similar? What makes the phosphorous cycle different?

-Both carbon and nitrogen involve getting the element out of the biosphere into the atmosphere. Phosphorous is found in the atmosphere.

-Both carbon and nitrogen involve putting the element into the biosphere and atmosphere. Phosphorous is not found in the atmosphere.

-Both carbon and nitrogen involve putting the element into the biosphere and atmosphere. Phosphorous is found in the atmosphere.

-Both carbon and nitrogen involve getting the element out of the atmosphere into the biosphere. Phosphorous is not found in the atmosphere.