Across
- 3. Which part of the brain regulates breathing?
- 6. Penciline is an example of?
- 9. The word "acid means?
- 10. Our brain is protected by three layers of connective tissues called?
Down
- 1. Kidneys eliminate waste by filtering?
- 2. Nitrogen is widely used in?
- 4. The main source of solar energy?
- 5. The major organ of the excretory system is?
- 7. How many primary type of bone cells in the body?
- 8. The symbols of Chlorine?