Q: What term is used to describe a process in which material travels from regions of high concentration to low concentration until equilibrium is reached?


Read this paragraph and choose the correct option from the provided answers:

The folded surfaces of the gills provide a large surface area to ensure that the fish gets sufficient oxygen. Diffusion is a process in which material travels from regions of high concentration to low concentration until equilibrium is reached. In this case, blood with a low concentration of oxygen molecules circulates through the gills. The concentration of oxygen molecules in water is higher than the concentration of oxygen molecules in gills. As a result, oxygen molecules diffuse from water (high concentration) to blood (low concentration), as shown in Figure 39.5. Similarly, carbon dioxide molecules in the blood diffuse from the blood (high concentration) to water (low concentration).

 Choices:

- fission

- active transport

- Osmosis

- diffusion


A:
diffusion