Biology crossword

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Across
  1. 1. - Movement of water across a membrane.
  2. 3. - Community of living and non-living things.
  3. 9. - Protein that catalyzes reactions.
  4. 12. - Building block of tissues.
  5. 13. - Specialized structure within a cell.
  6. 15. Infectious agent that requires a host.
  7. 20. - Maintenance of stable internal conditions.
  8. 21. Jelly-like substance within cells.
  9. 23. Group of similar organisms.
  10. 25. - Remains of ancient organisms.
  11. 27. Process of producing offspring.
  12. 28. - Nerve cells that transmit signals.
Down
  1. 2. Relating to cells.
  2. 4. Segment of DNA; unit of heredity.
  3. 5. Interaction between two different organisms.
  4. 6. Molecule carrying genetic information.
  5. 7. Selection Process where organisms better adapted survive.
  6. 8. - Process by which plants make food.
  7. 10. - Structure containing DNA in cells.
  8. 11. Basic unit of life.
  9. 12. One half of a chromosome.
  10. 14. - Green pigment in plants.
  11. 16. Large geographic area with specific climate and organisms.
  12. 17. - Process of cell division.
  13. 18. - Chemical messenger in the body.
  14. 19. Substance to stimulate immunity.
  15. 22. Change in DNA sequence.
  16. 24. - Trait that improves survival.
  17. 26. - Tiny organism, often single-celled.