Across
- 2. The openings of the nose where air enters.
- 5. Living things need oxygen to ________.
- 7. Air enters and leaves our body through the ________.
- 9. The hairs in the nose help keep the air ________.
- 11. Running and exercising are examples of physical ________.
- 12. This gas is found in the air and is given out when we breathe out.
- 15. Oxygen is carried around the body by the ________.
- 16. The gas that makes up the largest part of air.
- 17. These trap dust and dirt in the nose.
- 19. Oxygen is transported to all parts of the ________.
- 20. The tube that carries air from the nose to the lungs.
- 21. The organs where oxygen enters the blood.
- 23. Breathing rate is measured by the number of breaths in one ________.
Down
- 1. Fish breathe using their _________.
- 3. The number of breaths taken in one minute is called the breathing ________.
- 4. Tiny openings on leaves are called _________.
- 6. The system in our body that helps us breathe.
- 8. Air is made up of different ________.
- 10. The gas that plants take in to make food during photosynthesis.
- 13. Oxygen is ________ into the blood in the lungs.
- 14. The process of taking air into and out of the body.
- 18. The gas that living things need to stay alive.
- 22. Tiny particles trapped by the hairs in our nose.