Zoology

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Across
  1. 1. Animals with a backbone
  2. 5. No longer in existence
  3. 7. Any animal that feeds on flesh
  4. 9. Lacking a back bone or spinal column
  5. 11. Length of time between fertilization and birth
  6. 13. Studies the behavior of animals in their natural habitat
  7. 14. Operating or living in water
  8. 15. Organisms with bodies that are warmed by heat generated by metabolism
Down
  1. 2. Innermost germ layer of most animals
  2. 3. Organisms that do not depend on one particular organism for food
  3. 4. Organism that obtains energy by eating plants and animals
  4. 6. Area where an organism lives, including the biotic and abiotic factors that affect it
  5. 8. Organism that obtains energy by eating only plants
  6. 10. The back or upper surface of an animal or organ
  7. 12. Outermost germ layer of most animals
  8. 13. Concerns with the behavior of animals in their natural habitats