You esophagus is your throat. 
        
                    
             
        
        
        
Answer:  
 only three house flies were collected for an experiment
 
        
                    
             
        
        
        
The diffusion of water through a cell membrane to reach dynamic equilibrium.
        
                    
             
        
        
        
Answer:
A few examples could be an increase in food, an increase in shelter, a decrease in predators, or more land.