set-2

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Across
  1. 2. Help us to prevent certain diseases
  2. 4. Protects our heart and lungs
  3. 5. The fuel can only burn if the _________ is sufficiently high
  4. 7. Fire can only burn if there is plenty of ________.
  5. 9. A rich source of fats
  6. 10. Essential for strong bones and teeth
  7. 11. A simple machine which has two inclined planes put together
  8. 12. Is the ability of capacity to work
Down
  1. 1. Last 2 pairs at the bottom of the ribcage
  2. 2. 33 of them forms the backbone
  3. 3. Is also a breastbone
  4. 6. Excessive intake of food rich in fats makes us this
  5. 8. A substance that can burn