Which biogeochemical cycle has the least activity because the essential element is mostly stored in rock?

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answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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14 days is the half-life of phosphorus-32