science

123456789101112131415
Across
  1. 5. a chemical made by some cells to change how other cells work
  2. 6. kill pests
  3. 7. small bones in the back
  4. 8. studies plants
  5. 9. break down manure and release mineral salts from it
  6. 13. chemical reaction that happens in all living cells
  7. 14. a behaviour learned within a few hours after the birth
  8. 15. where photosynthesis occurs
Down
  1. 1. thousands of different substances
  2. 2. an alloy of copper and zinc
  3. 3. the seed starts to grow
  4. 4. 46 of them in your body
  5. 10. scientist who study insects
  6. 11. shaped to reduce air resistance
  7. 12. part of the rib cage