Answer:
vaccines have the smallest amount off the grid they are for in them so that you body can attack and get used that virus so that when you get it you are as bad 
Explanation:
I think
 
        
             
        
        
        
Answer:
Muscularis propria
Explanation:
The gastrointestinal tract has the following four basic layers:
1.  Mucosa is the innermost layer
2. Submucosa is underneath the Mucosa
3. Muscularis propria
4. Adventitia is the outermost layer
Muscularis propria  is the one that comes in contact with the food that you eat.
 
        
             
        
        
        
Isn’t it 37.2 trillion cells if that is wrong sorry