CROSSWORD PUZZLE YEAR 4

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