Question

what is the net flow of water down its concentration gradient through a selectively permeable membrane called?

simple diffusion

phagocytosis

osmosis

filtration

Explanation:

Simple diffusion refers to the movement of solutes, not water specifically, down a gradient. Phagocytosis is the engulfment of large particles by cells. Filtration is movement driven by pressure. Osmosis is specifically defined as the net flow of water down its concentration gradient across a selectively permeable membrane.

Answer:

O. Osmosis