Science

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Across
  1. 3. need our lungs
  2. 4. scientist say: "... of water"
  3. 5. a chemical that speeds up the reactions
  4. 8. with this organ we can breath
  5. 9. protein molecules are called
  6. 10. rain, who brings a lot of damage to the world
  7. 12. used in gas exchange and work with the cilia
Down
  1. 1. is found in the lungs and used in gas exchange
  2. 2. without it plants would die
  3. 6. this scientist invented the mole theory
  4. 7. molecules that fit into the active side
  5. 11. cells which covers in tiny hairs