respiration

http://kids.britannica.com/elementary/art/print?id=164347&articleTypeId=38

Different types of animals use different methods of respiration, or breathing.

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respiration (Children's Encyclopedia (Ages 8-11))

Respiration is the process that all living things go through to create the energy they need to live. This happens in the cells so it is also called cellular respiration. It usually involves exchanging two gases—oxygen and carbon dioxide. The cells take in oxygen and release carbon dioxide. This ...

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