Which process moves molecules and has these traits?–requires no energy–moves from high concentration to low concentration–moves from uneven distribution to even distribution–can occur when there is no membrane

Diffusion moves molecules from an area of high concentration to an area of low concentration, spreading them out until they are more evenly distributed. It does not require energy and can happen without a membrane. Osmosis is a specific type of diffusion that requires a selectively permeable membrane, so diffusion is the best answer.

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