cells

2. membrane controls what goes in and out of the cell
5. group of similar cells working together
9. fluif filled organells
12. gets rid of waste
13. system group of similar organs working together
15. discovered animal cells
16. powerhouse of cell
19. reticulum flattened membrane sacs
20. site of protein synthesis
21. process by which a call engulfs and digests a solid particle
22. the movement of water from an area of high concentration to an area with low concentration

1. transport movement of materials which requires an expendtiture of energy
3. process of maintaining a constant interval environment
4. movement of particles from an area of high concentration to low concentration
6. movement of materials out of cell
7. control center
8. body system of fluid filled canals used for transport of materials
10. involed in cell division only in animal cells
11. discovered the nucleus
14. sites of photosynthesis
17. small sacs containing digestive enzymes
18. double helix