obtaining energy part:2

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Across
  1. 5. they eat only meat
  2. 7. its the act of exchanging oxygen and carbon dioxide
  3. 8. a system that helps you breathe
Down
  1. 1. it occurs in every cell in an animal
  2. 2. most of them trap and eat microscopic organisms
  3. 3. it has nine air sacs
  4. 4. an animal that eats plants
  5. 5. a cell that filters food
  6. 6. all of them have closed circulatory systems