The document summarizes a biology lesson on homeostasis and transport. It discusses three types of passive transport - osmosis, diffusion, and facilitated diffusion. It defines osmosis as the movement of water across a membrane towards an area of higher water concentration without needing energy. Diffusion is the movement of molecules from an area of higher to lower concentration. Facilitated diffusion uses protein carriers. Active transport uses energy to move molecules against a concentration gradient, such as the sodium-potassium pump moving sodium out of cells and potassium in. The lesson defines key terms and provides examples to distinguish the different transport mechanisms.