Biogeochemical cycles on Earth serve a variety of different purposes. What do the biogeochemical cycles have in common? a. They all serve the same function in sustaining life on Earth. b. They all include only nonliving components of an ecosystem. c. They are all essential for sustaining life on Earth. d. They all include only living components of an ecosystem.

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According to the fact that such cycles as carbon cycle, nitrogen, and water cycle are essential things that keep our planet in state, the third option best shows what the biogeochemical cycles have in common. So, I am absolutely sure that the only correct answer which realy makes sense is c. They are all essential for sustaining life on Earth

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