Answer: D - Lipids
Lipids provide a long term energy storage because they contain longer C-H bonds compared to the other organic molecules, making it easier for them to store larger amount of energy. Moreover, upon burning they produce twice the amount of calories compared to that of the carbohydrates. 
        
             
        
        
        
The Central Nervous System
     -Serves as the control center for the body
The Peripheral Nervous System
     -Sends information to
and from the brain and spinal cord
     -Divided into the
sensory somatic nervous system and the autonomic nervous<span> <span>system</span></span>
 
        
             
        
        
        
1.) It is True that when a cell is put into an isotonic solution, individual water molecules cannot move back and forth across the cell membrane. 
2) It is False that a when a cell is put into a hypertonic solution, there is a net movement of water molecules across the cell membrane into the cell. 
3) It is True that when a cell is out into a hypotonic solution, there is net movement.
4) It is False that the movement of any solvent across a semi-permeable membrane is called osmosis.
        
             
        
        
        
The heart is an example of an organ. 
 
        
             
        
        
        
I believe the correct answer is <span>Monosaccharide.
I hope this helps you! :)</span>