Animal Crossword Puzzle

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Across
  1. 5. A single individual has both male and female reproduction organs
  2. 8. The inner shell of an organism
  3. 9. Animals that have no backbone
  4. 11. Has no left and right, only top and bottom
  5. 15. An organ that connects the developing fetus to the uterine wall
  6. 16. A type of connective tissue that is firm and flexible
  7. 17. Opposite sides are similar, most marine animals have this
  8. 18. Lower ecological zone in a body of water
  9. 19. Body that is free swimming and sexual
Down
  1. 1. An outer shell of an organism
  2. 2. Asexual reproduction by which a new develops from parent tissue
  3. 3. A highly evolved and specialized organ present in pairs, one on each side of the anterior chest wall.
  4. 4. Sessile form of Cnidarians
  5. 6. Heat comes from the outside of their bodies
  6. 7. An organism must produce its own body heat through metabolism
  7. 10. system of vessels in echinoderms containing a circulating watery fluid that is used especially for the movement of tentacles
  8. 12. An air-breathing egg characterized by a shell and extraembryonic membranes.
  9. 13. It contains gas (usually oxygen) and functions as a hydrostatic,
  10. 14. Animals that have a backbone
  11. 19. A shedding process that happens to the animal then a formation of its replacement