Answer: circulatorysystem.
Explanation:
it could effect you because you could have one of the best times of your life!! but in all jokes aside most substances are unsafe to use and or addictive, however is you use non addictive safe drugs like lsd or weed you should be fine however i dont recommend it considering its illegal.
This should simply this question
13×30÷4
= 97.5
Villi is not associated with the stomach
Hope this helps!