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Across
  1. 5. An animal that has a backbone or spinal column.
  2. 8. very eager or insatiable appetite for something
  3. 9. To waver between different opinions
  4. 10. The tissue in plants that transports water
Down
  1. 1. To move in a smooth, wavelike motion or pattern.
  2. 2. A person who is highly skilled or accomplished
  3. 3. Extremely unhappy, miserable, or unfortunate.
  4. 4. provide immunity against a specific disease.
  5. 6. The scientific study of animals
  6. 7. a medium to large boat