Diffusion

The video discusses the fish disease 'ick' and its treatment using methylene blue, illustrating the concept of diffusion. Diffusion is explained as the movement of molecules from high to low concentration, occurring in various contexts like water and air. The video also covers factors affecting diffusion rates, such as temperature and molecule size, and emphasizes diffusion's critical role in biological processes like oxygen transport in the body.

Describe the difference between passive transport and active transport.

What are some factors that can affect the rate of diffusion?

Why is diffusion critical for all life, according to the text?