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Easy ten point for anyone who gets it right.

2007-04-11 20:40:02 · 2 answers · asked by nikki 1 in Environment

2 answers

They are naturally occuring elements in our environment.

2007-04-12 03:23:00 · answer #1 · answered by Christmas Light Guy 7 · 0 0

Several sources:

From burning anything that contains carbon.

From the decomposition of organic (i.e. carbon containing) materials

From animal resperation.

2007-04-12 22:25:28 · answer #2 · answered by Anonymous · 0 0

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