Q. Biogeochemical cycles are crucial to ecosystem function because
A) energy flows through ecosystems in one direction only and is eventually dissipated as heat
B) they keep the planet warm enough for living things to survive
C) nutrients and other life-sustaining molecules are in limited supply and must be continually recycled
D) they prevent catastrophic extinctions
โ Correct Answer: nutrients and other life-sustaining molecules are in limited supply and must be continually recycled
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