Body and its movement

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Across
  1. 4. part of the skeletal system is the brain protected by.
  2. 5. bone in the human body.
Down
  1. 1. protected by the rib cage.
  2. 2. of the fish that helps them to move.
  3. 3. given to the animals with backbone.
  4. 4. kind of skeleton does a cockroach have.
  5. 6. of muscles you use to lower your arm.
  6. 7. of the fish.