C Because the fact That best adapted animals in a population survive is part of natural selection
        
                    
             
        
        
        
Solar panels, windmills, hydro energy
        
             
        
        
        
The nitrogenous bases Adenine form two hydrogen bonds with thymine and the cytosine form three hydrogen bonds with the guanine. Simply, A combines with T and G combines with the C. It is often called as a complementary base pairing because of each base pair bonds only with its specific complementary base partner in a DNA molecule.