Animal Crossword Puzzle Creation

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Across
  1. 2. Cold-blooded animal trait
  2. 3. Has both male and female reproductive organs
  3. 4. Free-swimming cnidarian body form
  4. 5. Echinoderm system for movement and feeding, powered by water
  5. 7. Body with left and right halves
  6. 8. Body with no equal proportions in shape
  7. 9. Flexible connective tissue
  8. 13. Organ for buoyancy in fish
  9. 15. A sessile, tubular body form in cnidarians
  10. 16. Nutrient-exchanging organ during pregnancy
  11. 18. Warm-blooded animal trait
  12. 20. Internal(inside)skeletal structure
Down
  1. 1. Doesn't have a backbone
  2. 4. Shedding an outer covering for growth
  3. 6. Animal with a spinal column
  4. 10. Protective eggs enabling land development
  5. 11. External(outside)body covering for protection
  6. 12. Milk-producing organ
  7. 14. Body parts are arranged in a balanced way around the center of the body
  8. 17. Asexual reproduction method
  9. 19. Living at the bottom of a body of water