Answer: Mutualism is a relationship of two organisms wherein both organisms benefit from each other. ... Commensalism is a relationship of two organisms wherein one organism benefit from the other with neither harm nor benefit to the other
        
             
        
        
        
The benefit is that capturing the energy from the waves is another source of replenishable energy (like solar or wind power)
        
                    
             
        
        
        
Answer: Single cell organisms dont need a respiratory system because oxygen and carbon-dioxe diffuses between their body tissues and the enviorment.
 
        
             
        
        
        
Explanation:
It sends message directly to muscles and glands