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                              Q:
                           
                           
                                                      | A) they represent the lowest level of biological organization that is known | B) there is a transfer of energy through the system and it is lost | 
| C) the ultimate source of energy is the sun for nearly all known ecosystems | D) they contain both living and nonliving components | 
                              Answer:   A) they represent the lowest level of biological organization that is known
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
 
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