Which choice describes diffusion? The movement of a substance across the cell me

Question

Which choice describes diffusion? The movement of a substance across the cell membrane against its concentration with the help of transport proteins and ATP. The movement of a substance across a cell membrane from an area of low concentration to an area of high concentration up its concentration gradient. The movement of a substance from a region where it is more concentrated to a region where it is less concentrated down its concentration gradient. The movement of a substance down its concentration gradient from a region where it is less concentrated to an area where it is more concentrated.

Explanation / Answer

Answer.

The movement of a substance from a region where it is more concentrated to a region where it is less concentrated down it's concentration gradient.

Explanation.

Movement of substances from a region of more concentration to region of less concentration is called diffusion.

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