Oxygen moving through the plasma membrane down its concentration gradient is an example of:

Question

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Simple diffusion is the movement of particles from an area of high concentration to an area of low concentration without the use of energy or transport proteins. Oxygen moving through the plasma membrane down its concentration gradient is an example of simple diffusion as it moves from an area of higher concentration (outside the cell) to an area of lower concentration (inside the cell) without the use of energy or transport proteins. Active transport and facilitated diffusion both require transport proteins and/or energy, while osmosis involves the movement of water across a membrane, not a gas like oxygen.

Oxygen Moving Through the Plasma Membrane Down Its Concentration Gradient