science work

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Across
  1. 3. AND KEY MODEL
  2. 6. SHEATH
  3. 7. / POLYMER
  4. 8. GLANDS
  5. 10. RESPIRATION
Down
  1. 1. (ALVEOLUS)
  2. 2. SITE
  3. 4. ACID
  4. 5. MARROW
  5. 9. RESPIRATION