Biological cycles are crucial to ecosystem funciton because
A. they keep the planet warm enough for living things to survive
B. nutrients and other life sustaining molecules are in limited supply and must be continually recycled
C. energy flows through ecosystems in one direction only and is eventually dissapated as heat
D. they remove poisons and keep them locked up in
E. they prevent catastrophic extinctions
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Added: 12/14/2008
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