Answer:
The natural home or environment of an animal, plant, or other organism.
Explanation:
 
        
                    
             
        
        
        
A parasite could determine the size of the population. Whether it grows or shrinks. It could also change genetics
        
             
        
        
        
Rainwater can replace or replenish freshwater sources.
Precipitation, such as rainwater, is the source of freshwater on Earth.
When the amount of surface freshwater increases, so does the amount of groundwater.
Human activity, such as taking a bath, may change the quality of a freshwater resource. :)