Across
- 4. An organ with over 500 jobs in the body.
- 8. A type of digestion where food is ripped and ground up.
- 9. A wispy high altitude cloud that contains ice crystals and appears on sunny days.
- 10. The layer of the atmosphere that contains the ozone layer.
- 11. 21% of the atmosphere is made of this gas.
- 13. The organ where a baby grows and develops.
- 14. This pair of organs helps to clean toxins from your blood and also helps control your blood pressure.
- 15. The name of your science teacher.
Down
- 1. The tubes where the egg and sperm meet or fertilization occurs.
- 2. The layer of the atmosphere where all weather occurs and where we live.
- 3. Blood vessels that travel away from the heart.
- 5. The body system that is responsible for exchanging oxygen and carbon dioxide gas within the body.
- 6. All body systems work together to keep this balance.
- 7. The gas that makes up most of our atmosphere.
- 12. Blood vessels that travel towards the heart.