Jacobs cross word puzzle

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Across
  1. 2. dioxide 1 of the 3 pieces to get energy
  2. 6. breaks down from starch
  3. 7. system breaks down food
Down
  1. 1. system takes in air
  2. 3. you get it from breathing in air
  3. 4. oxygen, glucose, and other molecules go there
  4. 5. acid breaks down into protein