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Across 3. A compound that contains chains of subunits and carbon. 6. Structure that makes up chromosomes. 8. Studied animal cells and contributed to the original cell theory. 10. A substance that cannot be broken down chemically or physically. 16. Organisms made up of one cell. 17. Studied plant cells and contributed to the original cell theory. 18. First person to describe and name cells. 19. Any living thing.

Down 1. An element that is found in all organic compounds. 2. Credited for making the first microscope. 4. Organ-like structures that make up cells. 5. The process of which plants(and other organisms) make carbon dioxide and water. 7. Controls cells activities and contains chromosomes. 9. Organisms made up of more than one cell 10. Cells that have an organized nucleus. 11. Discovered that new cells came from the division of old cells. 12. Jelly-like substance that contains the organelles. 13. Two or more different elements combined. 14. Discovered the cell nucleus. 15. Basic unit of structure and function in all living organisms.