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Across 1. Leeuwenhoek discovered many microscopic _______________. (Fact #34) 6. Schleiden concluded all _____________ are made of cells. (Fact #38) 7. ____________________ observed water samples. (Fact #33) 9. Animalcules means little ______________. (Fact #37) 11. Organ systems perform ________________ functions. (Fact #56) 12. Cells are organized into different ______________. (Fact #51) 13. Hooke named the structures he observed ______________. (Fact #28) 15. Tissues perform specific ______________. (Fact #53) 18. Cell _____________ explains cells and living things. (Fact #42) 20. A ______________ is a group of similar cells. (Fact #52) 21. Cell ________________ surround plant cells. (Fact #59)

Down 2. _____________________ perform specific jobs. (Fact #57) 3. Leeuwenhoek called them ______________. (Fact #36) 4. Scientists study cells to learn about _____________ and reproduction. (Fact #47) 5. ______________ are unicellular. (Fact #49) 8. A ____________ organism contains one cell. (Fact #48) 10. The word cell means small ________________. (Fact #29) 14. Organ _________________are groups of organs. (Fact #55) 16. _______________contain different tissues. (Fact #54) 17. Virchow proposed cells come from other _____________. (Fact #40) 19. Multicellular organisms contain _______________ cells. (Fact #50)