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When molecules move down their concentration gradient, they move from where they are Blank to where they are Blank.target 1 of 3target 2 of 3
Diffusion across a biological membrane is called Blank.

Answer 1

When molecules move down their concentration gradient, they move from where they are more concentrated to where they are less concentrated.

Diffusion across a biological membrane is called facilitated diffusion (if it involves specific transport proteins) or simply diffusion (if it occurs freely across the membrane).