Across
- 1. Group of tissues that work together to perform a specific function.
- 3. the natural process among organisms by which new individuals are generated and the species perpetuated.
- 5. Group of organs that work together to perform a certain task such as digestion or breathing.
- 9. Painful sores on the stomach lining often caused by the micro-organism H pylori
- 13. Usually unicellular organisms that can be seen only through a microscope
- 15. Describes a membrane with very small openings that allow particles of some substances but not other to pass through.
- 16. The basic unit of life
Down
- 1. Diffusion of water through a selectively permeable membrane.
- 2. Type of connective tissue found in the bone that produces red blood cells
- 4. Thin structure that encloses all the contents of plant and animal cells has tiny openings that allow particles of some substances but not others to pass through.
- 6. Made of more than one cell
- 7. Hair-like extensions that protrude from the surface of some unicellular organisms and from some cells in multicellular organisms.
- 8. any of the cellular elements of the blood, as white blood cells or red blood cells.
- 10. Structures in cells that perform a certain function
- 11. The movement of particles of a substance from an area of higher concentration to an area of lower concentration.
- 12. Group of similar cells working together to perform a specific function
- 14. Foot-like projections on an amoeba used for movement and capturing food.