Question

the spreading of molecules from a high concentration to a low concentration. active transport osmosis diffusion

Explanation:

To solve this, we analyze each term:

• Active transport: Moves molecules against concentration gradient (low to high), requiring energy. Doesn't match.
• Osmosis: Specific to water molecules moving across a semi - permeable membrane (still from high to low water concentration, but is a type of diffusion for water).
• Diffusion: Defined as the spreading of molecules from an area of high concentration to an area of low concentration, which matches the given description.

Answer:

diffusion (the option with the label "diffusion" in the orange box)