What factor made evolution more very slowly for the first two billion years of life on earth? 
       
      
                
     
    
    
    
    1  answer:
            
              
It was an asteroid that came to earth two billions years ago and scientists says that there might be another one coming.so we might live in space for a couple of months or years. so that why the dinosaur die.
                                
             
         	
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A. It's a reliable source because it's from the government, not a website based on other people's opinions.
 
        
                    
             
        
        
        
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1.a unicellular organism has only 1 cell while a multicellular organism has 1 or more cell
2.a unicellular organism is a prokaryotic cell or bacteria, while a multicellular organism is mainly a eukaryote
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C.All organisms have cells with different shapes and functions
        
             
        
        
        
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In order, from least complex to most complex:
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