Drag the terms on the left to complete the sentences on the right. more concentrated passive transport less concentrated active transport when molecules move down their concentration gradient, they move from where they are to where they are . diffusion across a biological membrane is called .

Passive diffusion is a form of passive transport and a type of diffusion by which particles from a high concentration gradient passes through a biological membrane to a low concentration gradient. Diffusion, or simple diffusion on the other hand, is the passage of molecules without the need of a membrane.