Because it was old and irlt would be more stronger?????
        
             
        
        
        
A nebula is an interstellar cloud of "Dust and Gas"
        
                    
             
        
        
        
Carl Linnaeus
 a guy from Sweden
 
        
                    
             
        
        
        
The main reason for the species extinction is for the ecological changes.
        
             
        
        
        
I answered it before !! 
B is the correct one !! Mitosis in two identical diploid and meiosis in 4 genetically varied haploid !!