Where can I find info on vitamins and minerals in the sections on here?
questions (a) what is digestive system? (b) why is digestion necessary .
2 exp ? the term peristalsis & what effects
3 out line the physical & chemical digestion of food in the stomah
4 why does the stomach have the following
(a) ph of 1_2
(b) lining layer of mucus
(c) enzyme pepsin
(c) thick muscle wall?