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        Summary 
        
         
          
           | DescriptionAuto-and heterotrophs.svg | 
           
             English: Cycle between  autotrophs and  heterotrophs. Autotrophs can use  carbon dioxide (CO2) and  water to form  oxygen and complex organic compounds, mainly through the process of  photosynthesis. All organisms can use such compounds to again form CO2 and water through  cellular respiration. 
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           | Date | 
           22 April 2009 | 
          
          
           | Source | 
           Images used: 
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           | Author | 
            Mikael Häggström | 
          
         
         
        
         
          
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             Permission is granted to copy, distribute and/or modify this document under the terms of the  GNU Free Documentation License, Version 1.2 or any later version published by the  Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled  GNU Free Documentation License.  http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue 
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