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2. the amount of solute in a given amount of solvent.
3. process by which organisms maintain a relatively stable internal environment.
6. The movement of materials through a cell membrane without using energy.
7. A property of a plasma membrane that allows some substances to cross more easily than others.
8. flexible double-layered sheet that makes up the cell membrane and forms a barrier between the cell and its surroundings.
9. Diffusion of water through a selectively permeable membrane.
10. full of holes; permeable to liquids.
12. A collection of tissues that carry out a specialized function of the body.
13. Movement of specific molecules across cell membranes through protein channels.
15. the process by which molecules move from an area of higher concentration to an area of lower concentration.
18. Having the same solute concentration as another solution.
19. A group of similar cells that perform the same function.

1. separate roles for each type of cell in multicellular organisms.
4. A group of organs that work together in performing vital body functions.
5. the movement of materials through a cell membrane using energy.
11. process by which a cell takes material into the cell by infolding of the cell membrane.
14. Having a lower concentration of solute than another solution.
16. Process by which a cell releases large amounts of material.
17. Having a higher concentration of solute than another solution.