An earthworm has a complete digestive system.
       
      
                
     
    
    
    
    
    1 answer:
            
              
              
                
                
I think the answer is d ... hope this helps
                                
             
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Develop diseases because they have little genetic variation.
        
             
        
        
        
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The birthrate may rise.
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Around the ages 9-14. On average, 12 is the average age. 
 
        
                    
             
        
        
        
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An ion
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