Answer:
Step-by-step explanation:
Diffusion is the movement of molecules or ions from an area of high concentration to an area of low concentration. Cells use diffusion to transport substances across their membranes to maintain homeostasis and carry out life processes. For example, oxygen and nutrients diffuse into cells from the surrounding environment, while waste products and carbon dioxide diffuse out. The diffusion of ions such as sodium, potassium, and calcium across cell membranes is also essential for nerve and muscle function. Therefore, diffusion plays a crucial role in the biological processes that sustain life.