Easy question easy points here

QUESTION
SOME FOOD SUBSATNCES MOVE BACK INTO THE BLOOD THEOUGH DIFFUSION. WHAT DOES THIS MEAN ?

Diffusion is a net movement of molecules or ions from a region of higher concentration to a region of lower concentration down a concentration gradient at a random movement.

So food molecules to move into the blood stream because blood is a region that has a lower concentration of molecules.

what's the rest of the question