Question

all of the following are forms of passive transport except - a osmosis b facilitated diffusion c a protein pump d diffusion

Explanation:

Passive transport is the movement of substances across the cell membrane without the use of energy. Osmosis is the diffusion of water across a semi - permeable membrane, facilitated diffusion uses transport proteins to move substances down their concentration gradient, and diffusion is the movement of substances from an area of high concentration to low concentration. These are all passive. A protein pump uses energy (ATP) to move substances against their concentration gradient, which is active transport.

Answer:

C. a protein pump