Respiration Crossword puzzle

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Across
  1. 5. A naturally occurring colorless gas
  2. 7. A vital,colorless,oderless gas
  3. 8. A bald man that is my teacher
  4. 9. often called the energy currency
Down
  1. 1. an essentail for all life
  2. 2. the bodyś main sugar
  3. 3. vital organelles in eukaryotic cells
  4. 4. organisms that get energy by eating other organisms
  5. 6. the capacity to do work