Question

The movement of substances from a region of higher concentration to a region of lower concentration is called __.

Answer 1

The movement of substances from a region of higher concentration to a region of lower concentration is called diffusion.

This is the same process that causes the yummy smell of food spread around a house even though food is cooked in the kitchen. The kitchen has a higher concentration of the yummy smelling substances in the air than the rest of the house. This causes the substances to move into the rest of the house. This process is known as diffusion.