The History of Rats and Humans

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Across
  1. 2. A place equipped for scientific experiments
  2. 6. An underground conduit for waste
  3. 8. A person or animal with whom one spends time
  4. 9. A change in the DNA sequence within a gene or chromosome of an organism
  5. 10. The brain's ability to reorganize itself by forming new neural connections
  6. 14. A widespread occurrence of an infectious disease
  7. 15. The conditions in which living things exist
  8. 16. The process by which an economy shifts to manufacturing
  9. 19. A contagious bacterial disease
  10. 21. A species able to thrive in various environments
  11. 23. A group of living organisms consisting of similar individuals capable of interbreeding
  12. 24. The complete set of genes in an organism
  13. 25. A change by which an organism becomes better suited to its environment
  14. 26. Relating to past events
  15. 27. A substance that can cause illness or death
  16. 28. Tending to spread prolifically and harmfully
  17. 29. The classification of organisms in an ordered system
Down
  1. 1. Systematic investigation to establish facts
  2. 3. The process by which new organisms are produced
  3. 4. The ability not to be affected by something, especially adversely
  4. 5. The growth of cities
  5. 7. The process by which organisms change over time
  6. 11. A belt of the heavens divided into twelve signs, each associated with certain symbolic meanings
  7. 12. The act of killing or destroying completely
  8. 13. A microorganism that causes disease
  9. 14. The branch of biology dealing with the relations of organisms to one another and their surroundings
  10. 17. The process of taming an animal and keeping it as a pet or on a farm
  11. 18. An unusually large number of animals or insects in one place
  12. 20. Wild mammals or birds that are harmful to crops, farm animals, or game
  13. 22. Interaction between two different organisms living in close physical association