Freshwater does not contain any salt, salt water does however contain salt.
        
                    
             
        
        
        
A) A flap in the heart located between each atrium and ventricle.
Hope it helps! :)
        
                    
             
        
        
        
Most plants that grow in a desert environment have the ability to retain water in leaves or paddles ( if cactus ) and have deep roots to collect water that is deep in the ground  i hope this helps   <span />
        
                    
             
        
        
        
Answer:
Diffusion is powerful over a particular distance and bounds the size that a character cellular can gain. 
Explanation: If cellular is an unmarried-celled microorganism, consisting of an amoeba, it is able to satisfy all of its nutrient and waste needs via diffusion. If the mobile is too massive, then diffusion is useless at finishing all of these responsibilities.