1.+natural+ecosystem+change

Natural Ecosystem Change: Tentative Test Date MC ONLY (A) 10/1/12 or (B) 10/2/12: Nutrients and elements constantly cycle through the ecosystem in a complex series of reactions and interactions. Microbial activity plays a fundamental role in biogeochemical cycling. Ecological succession is a natural process by which an ecosystem changes over time. Ecological change can involve both small and large scales over short or long time spans. (pp. 64-80)

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