Question

Why do diffusion and osmosis occur?

Answer 1

According to the concentration gradients.

Explanation:

Both in diffusion and osmosis, the movement is according to the concentration gradients. But in the case osmosis, biomembrane is essential for acrossing the movement. Thak you.

Here is a video which describes how osmosis impacts onion cells placed into tap water and then into a salt water solution.

Hope this helps!