Question

moving with the concentration gradient means... movement of molecules from an area of higher concentration to an area of lower concentration. movement of molecules from an area of lower concentration to an area of higher concentration. movement of molecules that requires spending energy. moving through a semipermeable membrane.

Explanation:

The concentration gradient refers to the difference in the concentration of a substance between two areas. When molecules move with the concentration gradient, they move from an area where they are more concentrated (higher concentration) to an area where they are less concentrated (lower concentration). This is a passive process (does not require energy expenditure like active transport which moves against the gradient). Movement through a semi - permeable membrane is related to osmosis (for water) or diffusion (for solutes) but the key description of moving with the gradient is about the direction from high to low concentration.

Answer:

movement of molecules from an area of higher concentration to an area of lower concentration.