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Text File  |  1995-07-11  |  258b  |  8 lines
  1.   Bone tissue
  2. Bones are made up of layers of tissue:
  3. 1: A layer of spongy bone with lots of little holes.
  4. 2: Marrow cavity, filled with fat and blood vessels.
  5. 3: Periosteum, made of tough fibres and cells.
  6. 4: Layer of hard compact bone that gives strength.
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