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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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