human body systems

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Across
  1. 3. the system that breaks down food.
  2. 6. it is inside the skull.
  3. 7. it is the first organ in digestive system.
Down
  1. 1. the system that responsible for breathing.
  2. 2. it is found inside chest between two lungs.
  3. 4. A group of organs.
  4. 5. it is a red liquid inside the body