Explain what a concentration gradient is and what it means for a molecule to diffuse down its concentration gradient

A concentration gradient is the difference in concentration of a substance from one location to another. A molecule diffuses down its concentration gradient by moving from one region of higher concentration to a region of lower concentration. Both are proteins and may work with only specific molecules. is this your anwser? if not ill paraphase

How spaced out all the molecules are. To diffuse down a concentration gradient is to reduce a number of molecules in an area