The crossword

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Across
  1. 3. parts that keep things protected
  2. 4. a system of organs
  3. 5. sends messages
  4. 7. living organisms
  5. 8. a whole part of a body that carryouts movement
Down
  1. 1. parts that make you move
  2. 2. a system that controls the body
  3. 6. part of the skin
  4. 8. a single group of cells