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