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extendable bond
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external respiration
ex·ter·nal res·pi·ra·tion


noun 
Definition:
 
gas exchange between an organism and the atmosphere: the exchange of gases between an organism's respiratory system, e.g. the lungs in vertebrates, and the outside environment
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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