Answer: They represent different concepts
 
        
                    
             
        
        
        
Answer:
hormones
Explanation:
An example of materials commonly released this way is hormones. These are chemical messengers that are sent to the pituitary gland where they are released directly into the bloodstream. The blood then carries the hormones to different organs and tissues of the body in order to exert their specific function which varies depending on the specific type of hormones being secreted.
 
        
             
        
        
        
Equation: sunlight + Carbon Dioxide (6CO2) + Water (6H2O) = Glucose + Oxygen
Reactants: Sunlight + Carbon Dioxide + Water
Products: Glucose and Oxygen