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Across 3. A group of similar cells working together to perform a specific function. 6. A tough strand of tissue that connects a muscle to bone. 9. Blood vessel that carries blood away from the heart. 10. Any living thing,all of the organ systems working together. 12. Different types of organisms that interact in the same place at the same time. 14. Supports and shapes body, protects major organs, works with muscles to allow movement and makes blood cells. 17. A group of cells that make up special chemicals for your body. 19. An organism,virus or protein that causes disease. 20. Different organs working together to perform a major function.

Down 1. Takes oxygen into the body and removes carbon dioxide. 2. A blood vessel that carries blood back to the heart. 4. Substance that stimulates a response by the immune system. 5. Different tissues working together to perform a specific function. 7. Windpipe. Air flows from the lanryx through the trachea to he lungs. 8. Tough, flexible strand of connective tissue that holds bones together. 11. Specialized protein that binds to a specific antigen to tag it for destruction. 13. A fluid that carries gases,nutrients, and wastes through out the body. 15. Pair of organs that remove waste from the blood. 16. Is part of the throat that holds the vocal cords. 18. A place where two or more bones connect.