Biology biogeochemical cycles help?

Alice B-Rabbit

New member
So I'm a little stumped on what to do for something for my bio homework. The question is:

Draw a unified diagram that illustrates how carbon, oxygen, nitrogen, and phosphorus cycle together through the biosphere.

I'm sure no one will be able to actually draw a diagram, but I don't even understand what this means really.
My teacher is unavailable to help at the moment but I need to get it done now.
Can anyone help please?
 
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