Gas Exchange

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Across
  1. 3. respiratory surface found in terrestrial insects
  2. 4. the site of gas exchange
  3. 6. a mechanism enabling air or water to be transferred between the environment and a respiratory surface
  4. 7. the diffusion of gases down a concentration gradient across a respiratory surface
  5. 8. the movement of molecules from a region of high concentration to a region of low concentration
  6. 9. an organism made up of a single cell
Down
  1. 1. the rate the body expends energy
  2. 2. cells which have differentiated in the same way and grouped together
  3. 3. an organism that lives on land
  4. 5. an organism made up of lots of cells aggregated together
  5. 10. respiratory surface found in fish, aquatic insects, and amphibians