sentence2_structure: Diffusion<>is<>the process in which a substance naturally moves from an area of higher to lower concentration$$$a substance<>naturally moves<>from an area of higher<>to lower concentration<>the process
sentence1: Diffusion occurs according to a concentration gradient, that is, a solute will move from areas of high concentration (hypertonic) to areas of low concentration (hypotonic) until the concentration is equal (isotonic).
sentence2: Diffusion is the process in which a substance naturally moves from an area of higher to lower concentration.
question: What is the process in which a substance naturally moves from an area of higher to lower concentration called?