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respiration, photosynthesis, decomposition and combustion ie of fossil fuels or wood ...theres a lot more but id guess these are what you're looking for

2006-09-21 05:17:28 · answer #1 · answered by jo88 2 · 0 0

http://education.yahoo.com/reference/encyclopedia/entry/carboncy

There you go...that should take care of it.

2006-09-21 00:25:21 · answer #2 · answered by Shaun 4 · 0 0

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