A. To understand the nature of an experimental subject
        
                    
             
        
        
        
Because almost all small streams end up in bigger bodies of water.
        
                    
             
        
        
        
Yeah the answer above me makes sense...
 
        
             
        
        
        
The answer is B) the science of heredity
        
             
        
        
        
Answer:
c. overgrazed
Explanation:
plz mark B R A I N L I E S T