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Across 3. a group of different tissues that work together to do a job 4. a group of similar cells that work together 10. a stiff structure that surrounds the cell membrane 11. the double membrane surrounding the nucleus within a cell wall 12. a small structure that does a certain job in the cell 13. a group of organs that work together 14. the smallest part of a living thing that can carry out all the processes of life

Down 1. a structure that stores water or other materials 2. the fluid inside plant and animal cells 5. structures that release energy from the food 6. a covering that surrounds and protects the cell 7. use light energy from the sun to make food for a plant 8. a living thing made of cells 9. threadlike structures that contain information about characteristics of the plant or animal 11. the control center of the cell