Across
- 4. This animal breathe using their lungs when on land and using moist skin when they are in water.
- 6. Exhaled air contains _____ carbon dioxide compared to inhaled air.
- 7. The biggest planet in our solar system.
- 8. Plants needs sunlight, carbon dioxide, water and _____ for photosynthesis.
- 9. The seventh planet in our solar system.
Down
- 1. This animal breathe through spiracles.
- 2. Inhaled air contains more _____ compared to exhaled air.
- 3. The chest move _____ during exhalation.
- 5. The organs that are involved in the breathing process are nose, _____ ,and the lungs.