hemistry is the "scientific study of matter, its properties, and interactions with other matter and with energy". ... It is an experimental science in which theories are developed and tested against observations. The goals of physics include explaining and predicting how the universe works. Biology is the study of life.
 
        
                    
             
        
        
        
Answer:
The cell membrane is selectively permeable and able to regulate what enters and exits the cell, thus facilitating the transport of materials needed for survival. ... 
Explanation:
Because the membrane acts as a barrier for certain molecules and ions, they can occur in different concentrations on the two sides of the membrane.