Osmosis and Diffusion are different because: A. only Diffusion occurs across a cell membrane. B. diffusion may lead to lysis or crenation. C. diffusion is active transport, whereas Osmosis is passive transport. D. osmosis only occurs across a semi-permeable membrane.

Osmosis include red blood cells swelling up when exposed to fresh water and plant root while diffusion include perfume filling a whole room, a drop of food coloring spreading out to uniformly color a cup of water, and the movement of small molecules across a cell membrane. One of the simplest demonstrations of diffusion is adding a drop of food coloring in water.

I think osmosis is a type of diffusion which only occurs across a semi permeable membrane.