Biology final project

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Across
  1. 2. not exact or accurate; estimated
  2. 3. of, on, or relating to earth
  3. 4. designed for people to live in
  4. 8. light emitted by some substances after they are exposed to light
  5. 10. the ability to do something well
  6. 11. the natural home or environment of an animal, plant or other organism
  7. 13. to get smaller or more compact
  8. 17. backbone
  9. 19. a bone that holds teeth
  10. 20. a person who offers to do a task
  11. 21. required; not voluntary
  12. 22. the central part of something
  13. 23. a cavity that runs successively through each of the vertebrae and contains the spinal cord.
  14. 24. very small
Down
  1. 1. the bones that make up a backbone
  2. 5. of great value; likely to have a profound effect on success, survival, or well-being
  3. 6. be full of or swarming with
  4. 7. a chemical substance released by an animal
  5. 9. done by choice
  6. 12. is a muscular organ that help us taste food
  7. 14. a split in the surface of something
  8. 15. able to be used for a practical purpose or in several ways
  9. 16. the bone of the thigh or upper hind limb articulating at the hip and the knee
  10. 18. the chemical in hot peppers that creates a burning sensation in the mouth