Year 7 Science crossword challenge

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Across
  1. 2. A substance which cannot be broken down
  2. 4. He studied Finches...
  3. 5. The movement of particles from a high concnetraiton to a low concentration
  4. 6. Is in group 1 of the periodic table
  5. 9. A line of XXXX fit
  6. 10. I am found in plant cells but not animal cells
  7. 12. The colour of a safety flame
  8. 13. Part of a flowers reproductive organs
  9. 14. The stain used to view cells on a slide
  10. 18. A type of variable
  11. 19. The site of aerobic respiration
  12. 20. What the arrows
  13. 21. Neurone A type of specialised cell
  14. 22. The third planet from the sun
Down
  1. 1. What the U stands for in SLAPU
  2. 3. type of hormone
  3. 7. Your elbow is an example of this
  4. 8. A lens in a microscope
  5. 11. Part of a flowers reproductive organs
  6. 15. Where the egg is released from
  7. 16. A place where two bones meet
  8. 17. Found in the nucleus
  9. 18. A type of separation technique