Across
- 1. help with gas exchange of oxygen and carbon dioxide
- 3. a way to measure mass of an object
- 4. found on the outer shell of elements
- 10. a measurement of force
- 11. make up the universe
- 12. can not be treated with antibiotics
- 13. what keeps us on the ground
Down
- 2. where the sun can be found
- 5. allow us to see objects
- 6. allow us to taste
- 7. contains acid that helps with the digestion of food
- 8. what pumps blood around the body
- 9. the control centre of the body