Across
- 4. This system is the first line of defense against disease and injury
- 6. This system breaks down food and absorbs nutrients and gets rid of waste
- 12. An individual animal, plant, or single-celled life form
- 13. Responsible for movement of the body
- 14. System consists of brain, spinal cord, and nerves
- 15. Smallest structural and functional unit of a living thing
Down
- 1. Level of organization made up of cells
- 2. This system produces egg and sperm cells, transports and sustains these cells, and nurtures developing offspring
- 3. Protects from infection and disease; organs include lymph nodes, spleen, and bone marrow
- 5. Takes in oxygen and removes waste gases
- 7. This system supports the body, protects organs, and stores calcium
- 8. This system transports oxygen and other nutrients to cells and returns CO2 and other waste to lungs
- 9. Collection of specialized tissues that perform the same function
- 10. Produces hormones to share messages throughout the body
- 11. Level of organization made up of organs working together to perform a specialized function