Skeletal system 4.1

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Across
  1. 2. cartiledge is replaced by bone
  2. 5. mature bone cells
  3. 8. system that provides for attachment to muscles
Down
  1. 1. loss of density and strength in the bone
  2. 3. increase of density and thickness of the bone
  3. 4. cells that build new bone
  4. 6. main part is the backbone. holds up the body
  5. 7. thick bone tissue