| A | B |
|---|
| matter | anything that has mass |
| atom | the smallest building blocks of matter |
| molecule | two or more atoms that have joined |
| diffusion | the movement of molecules from high concentration areas to lower concentration areas |
| osmosis | when water moves across a selectively permeable membrane |
| cell membrane | the covering that surrounds a cell |
| permeable | when things can get through the membrane and cell membrane |
| selectively permeable | cell membranes where only certain materials can pass through |
| impermeable | cell membrane where things cannot pass through |
| passive transport | no energy is used by the cells to move molecules |
| active transport | movement of moelcules across the membrane from an area of low concentration to an area of high concentration |
| photosynthesis | plants use chemicals and energy from the sun to make food and survive |
| respiration | a combination of oxygen with food molecules making carbon dioxide and water |
| fermentaion | a process that gives off energy without using oxygen |
