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Biology 19 Online
OpenStudy (anonymous):

Why are the carbon cycle, the phosphorous cycle, the water cycle, and the nitrogen cycle all considered to be biogeochemical cycles? Because all these cycles include the organisms inhabiting water, land, and air. Because all these cycles include living organisms, the biosphere, and the chemical factors in them. Because all these cycles include nonliving organisms, the atmosphere, and the physical factors in them.

OpenStudy (anonymous):

B. Because all these cycles include living organisms, the biosphere, and the chemical factors in them. Answer A. fails to mention the inorganic chemical factors that enter living organisms and are fixed into organics by the autotrophs. Answer C fails to include the living organisms. Which one do you think?

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