30 biology cross word puzzle

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Across
  1. 6. - Essential macromolecule made of amino acids.
  2. 10. - Chemical messenger in the body.
  3. 11. - Structure containing DNA in cells.
  4. 12. - Small DNA molecule within a cell.
  5. 13. - Green pigment in plants for photosynthesis.
  6. 15. - Genetic material in organisms.
  7. 16. - Microscopic organism, often a bacterium.
  8. 19. - Any living thing.
  9. 22. - Change in DNA sequence.
  10. 25. - Group of similar cells performing a function.
  11. 26. - Change in species over time.
  12. 27. - Substance used to stimulate immunity.
  13. 28. - Pores on leaves for gas exchange.
  14. 29. - Movement of water across a membrane.
Down
  1. 1. - Interaction between two different organisms.
  2. 2. - Unit of heredity in living organisms.
  3. 3. - Protein that speeds up chemical reactions.
  4. 4. - Maintaining stable internal conditions.
  5. 5. - Remains of ancient organisms.
  6. 7. - Basic unit of life.
  7. 8. - Group of similar organisms that can breed.
  8. 9. - Cell division resulting in two identical cells.
  9. 11. - Element essential for life.
  10. 14. - Process plants use to make food.
  11. 17. - Variety of life in an ecosystem.
  12. 18. - Community of living organisms and their environment.
  13. 20. - Nerve cell that transmits signals.
  14. 21. - Material that makes up chromosomes.
  15. 23. - Control center of a cell.
  16. 24. - Protein that helps fight infections.