Across
- 2. We have billions of these in our bodies
- 3. A part of an organism such as a kidney
- 4. Removes waste from your blood
- 7. System made up of skin, nails, and hair
- 10. This system regulates behavior and includes your brain and spinal cord
- 11. This helps you breathe by filtering out bad air
Down
- 1. Defends against germs and sickness
- 2. A body system made up of your heart, blood vessels, and blood
- 5. A group of similar cells that perform a specific function
- 6. Breaks down food you eat
- 8. System made up of muscle tissues
- 9. This system helps produce offspring
- 12. A body system made up of bones and joints