Prey or predation is a biological interaction where a predator (an organism, often an animal) kills and eats its prey (another organism). 
Like a mouse getting caught and eaten by a bird of prey (Eagles, hawks, etc.)
        
             
        
        
        
Explanation:
One of the benefits of a vegetarian diet is a reduction in your impact on the environment. Animals store only a small fraction of the energy they extract from the food they eat, and the rest is wasted as heat.
 
        
             
        
        
        
A dependent variable is one whose value depends on another variable. Hope that helps you answer the question! 
        
                    
             
        
        
        
Answer: a they are made up of fatty acids