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'''Carbon dioxide''' in an odorless, invisible gas formed by the combustion of hydrocarbons. It is one of the human bodies major waste products, being excreted through exhalation.   
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'''Carbon dioxide''' in an odorless, invisible gas formed by the combustion of hydrocarbons, both nataurally, in the human body, and artificially, as fuel. It is one of the human bodies major waste products, being excreted through exhalation.   
 
It is used by plants in the process of [[photosynthesis]] to generate [[oxygen]].
 
It is used by plants in the process of [[photosynthesis]] to generate [[oxygen]].
  
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