1) A 2) B
Explanation:
Enzymes are catalyst, meaning that they could be use in several reaction and they speed up any chemical reaction rate. So knowing this, when the animal have more enzymes it will react more quickly with the food, making it digest the food more quickly. 
Hope the help, cheers 
 
        
             
        
        
        
When a ray passes<span> from air into glass the </span>direction<span> in which the </span>light<span> ray is traveling </span>changes<span>. ... This bending of a ray of </span>light<span> when  </span>passes from one substance<span> to </span>another substance<span> is called refraction. Hope this helps!!!</span>
        
                    
             
        
        
        
The heart is an organ (rather than a tissue) because it has an important (and complex) function. Tissues don't have nearly as many things in it as the heart does. 
Hope this helps! :)