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Across
  1. 6. the branch of biology that deals with the geographical distribution of plants and animals
  2. 8. places where fish are reared for commercial purposes; a fishing ground or area
  3. 9. evolutionary change within a species or small group of organisms
  4. 11. an animal which has a diet consisting mainly or exclusively of nectar
  5. 12. performing a similar function but having a different evolutionary origin
  6. 15. a shallow recess in a wall to display a statue or other ornament
  7. 16. rain, snow, sleet, or hail that falls to the ground
  8. 17. similar in position, structure, and evolutionary origin but not necessarily in function
  9. 18. waste or debris of any kind; gravel, sand, silt, or other material
  10. 22. degenerate, rudimentary, or atrophied, having become functionless in the course of evolution
  11. 23. the action or power of focusing one’s attention or mental effort; dealing with one thing
  12. 25. an organism that feeds on or derives nourishment from decaying organic things
  13. 28. the time or date at which the sun crosses the celestial equator; another name for equinoctial point
  14. 30. made or produced by human beings rather than occurring naturally; not existing naturally
  15. 31. a large natural or artificial lake used as a source of water supply; a supply
Down
  1. 1. another name for archaebacteria
  2. 2. the tidal mouth of a large river
  3. 3. an animal or person that eats food of both plant and animal origin
  4. 4. the formation of new and distinct species in the course of evolution
  5. 5. major evolutionary change
  6. 7. of or from outside the earth or its atmosphere
  7. 10. able to be maintained at a certain rate or level; conserving an ecological balance
  8. 13. the production and discharge of something
  9. 14. water which collects as droplets on a cold surface
  10. 15. existing in or caused by nature; having a color characteristic of the unbleached and undyed state
  11. 19. the halving of the number of chromosomes per cell that occurs at one of the two anaphases
  12. 20. an animal which feeds on dead organic material
  13. 21. destruction or slaughter on a mass scale; the mass murder of Jews under the German Nazis
  14. 24. a state in which opposing forces or influences are balanced
  15. 26. a body of permeable rock which can contain or transmit groundwater
  16. 27. an animal that feeds on plants
  17. 29. protect from harm or destruction; prevent the wasteful or harmful overuse of
  18. 32. convert into reusable material; return to a previous stage in a cyclic process; use again