human skeletal system

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Across
  1. 4. protect the lungs?
  2. 5. jaw bone?
  3. 6. what is the bone that protects the brain?
  4. 7. holds ribs together?
Down
  1. 1. bone next to fibula?
  2. 2. the thigh bone?
  3. 3. the most painful bone to break?
  4. 6. your tail bone?