The Phosphorous and Carbon Cycles Are Substantially Different in That

The phosphorous and carbon cycles are substantially different in that

A) humans have greatly affected the carbon cycle only.
B) phosphorus, unlike carbon, is not essential for life and does not stay in organisms for long.
C) carbon, unlike phosphorus, exists in rocks only in small quantities.
D) unlike the carbon cycle, very little of the phosphorus cycle involves the atmosphere.
E) None of the above

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