Part 1: A Decomposer's Part in Cycles of Matter
http://www.pbslearningmedia.org/asset/tdc02_vid_decompose/
Part 2: Carbon Cycle
http://www.windows2universe.org/earth/climate/carbon_cycle.html
Part 3: Nitrogen Cycle
http://www.sites.ext.vt.edu/virtualfarm/flash_mov/nitrogencycleintro.swf
Part 4: Transpiration's Part in Cycles of Matter
http://techalive.mtu.edu/meec/module01/Transpiration.htm
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