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Why do we need to respire?

Question asked by: knowitall
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We respire in order to exchange gases that we don't need for gases we don't.

We take in oxygen and breathe out carbon dioxide which is a waste product of respiration. All the nitrogen in the air is unreactive relatively and not affected by these processes.

By: Unknown
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Why respire in order to exchange gases we get rid of waste gases in order for other gases. We humans exchange Carbon Dioxide for Oxygen with the trees.
By: Miniman

Date of comment: Fri, Jan 25th 2013

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