Runoff in neighborhoods can be a problem because as the water runs it can collect pollutants such as oil, pesticides, bacteria, etc. These pollutants can end up in our drinking water or can run into our fishing supply and even our swimming water... I wouldn't want to be swimming or eating fish that was swimming in pesticides and bacteria. 
        
             
        
        
        
Answer:
what do you want to talk about?
 
        
                    
             
        
        
        
<span>C5H12 has only 3 isomers. They are pentane, butane and propane.</span>
        
             
        
        
        
Heterozygous parents would have the genotype Rr. In a punnett square, this would show a result of 25% homozygous dominant (RR) offspring, 25% homozygous recessive (rr) offspring, and 50% heterozygous (Rr) offspring.
(I attempted to simulate a punnett square with the text)
    <u>  </u><u>R         r    
</u><u />R| RR  |  Rr
<u></u>r | Rr   |   rr<u>
</u>