science

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Across
  1. 2. moisture excreted through pores
  2. 3. gas produced by respipration
  3. 6. vital organ important for excretion
  4. 7. liquid excreted through kidneys
Down
  1. 1. process of inhaling and exhaling
  2. 2. body's largest organ
  3. 4. liquid circulating through the heart
  4. 5. essential gas needed to live