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Across 4. final stage of the cell cycle and it also splits into 2 daughter cells 5. large oval organelle that contains the cell's genetic material in the DNA and controls many of the cell's activities 8. basic unit of structure and function in living things 9. a thin, flexible barrier that surrounds a cell and controls what substances go in and out of the cell

Down 1. some substances can cross through the membrane well others cannot 2. process by which molecules move from an area of higher concentration to an area of lower concentration 3. tiny cell structure that carries out a specific function within the cell 4. a rigid supporting layer that surrounds the cell of plants and some other organisms 6. regular sequence of events in which the cell grows, prepares for division, and then divides into 2 daughter cells 7. a sac-like organelle that stores water, food, or other materials needed by the cell