Mutualism, both of the animals benefit from the relationship. 
        
                    
             
        
        
        
They breathe through their skin. Air dissolves on the mucus of their skin, so they MUST stay moist to breathe. If worms dry out, they suffocate. As fresh air is taken in through the skin, oxygen is drawn into the worm's circulatory system, and the worm's hearts pump the oxygenated blood to the head area.
        
                    
             
        
        
        
Answer:
They both have fatty acids.
Explanation:
which vary in number whereby triglycerides has three fatty acids while phospholipids have two fatty acids.
 
        
                    
             
        
        
        
When the fish is put into fresh water, suddenly the concentration around them is very low and the water potential is extremely high. Water will now move from the relatively high water potential in the water to the relatively low water potential in the cells, the cells start to burst and the fish dies. 
        
                    
             
        
        
        
Answer:
Your body has different kinds of cells. Though they might look different under a microscope, most cells have chemical and structural features in common. In humans there are about 200 different types of cells and within this cells there are about 20 different types of structures or organelles.