fun activity

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Across
  1. 3. throw out waste in the form of urine
  2. 4. protects our heart and lungs
  3. 7. gas which is breathed out by lungs
  4. 8. carries messages from sense organ to brain
Down
  1. 1. produces bile juice
  2. 2. system framework of bones
  3. 5. muscles which are not in our control
  4. 6. link between arteries and veins