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Q: Biogeochemical cycles are crucial to ecosystem function because

  • 1
    they keep the planet warm enough for living things to survive
  • 2
    energy flows through ecosystems in one direction only and is eventually dissipated as heat
  • 3
    they prevent catastrophic extinctions
  • 4
    nutrients and other life-sustaining molecules are in limited supply and must be continually recycled
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Answer : 4. "nutrients and other life-sustaining molecules are in limited supply and must be continually recycled"
Explanation :

Answer: D) nutrients and other life-sustaining molecules are in limited supply and must be continually recycled 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.

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