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→Key Stage 3
: There is around 1kg of [[Bacteria in Digestion|bacteria]] inside the '''small intestine''' which helps [[digestion|digest]] the food.
: There are [[Digestive Enzyme|digestive enzyme]]s in the '''small intestine''' which break down large [[molecule]]s into smaller [[molecule]]s.
: Only small [[molecule]]s can be [[Absorb (Biology)|absorb]]ed into the blood through the wall of the '''small intestine'''.
==Key Stage 4==