Answer:Тhey help to break down food so that we can absorb the nutrients within. As specialists in their fields, each one has a specific role to play in stain removal. Lipases are responsible for breaking down oils and fats whereas proteases break down protein and starch, such as blood and gravy.
 
        
             
        
        
        
Answer:
Providing a controlled source of water vapour through which water can be vaporized into the plant envoirment. 
Explanation:
Humidity ratio is the ratio of the mass of water in air to the mass of dry air. Humidity is needed in some conditions where the air is very dry. In a very dry air setting, there can be excess moisture loss from the plant surface, increasing the Humidity ratio can counter this effects and reduce excess moisture loss. 
 
        
             
        
        
        
that they are not soluble with water
 
        
             
        
        
        
They do lower the activation energy but they provide an alternate pathway for the reaction to happen quicker and they do not get used up in the reaction