Across
- 2. individual zooid of a compound or colonial organism
- 4. system that consists of eating
- 8. 50/50 body symmetry
- 10. any of various flat worms of the class Cestoidea
- 13. eject-able tread that causes a sting
- 15. symmetry that branches out of one point
- 18. consisting of or divided into segments
- 19. diffuse branching network of nerve cells
- 20. system that works with the brain, nerves, spine
Down
- 1. one of the oldest species that hasn't evolved much
- 3. large fresh water leaches
- 5. the cavity in which the jellyfish's food stays
- 6. an external covering or integument
- 7. marine invertebrate in Echinodermata phylum
- 9. any invertebrate of the phylum Mollusca
- 11. small, air breathing arthropods
- 12. inhalation and exhalation
- 14. chiefly marine animal of the phylum Porifera
- 16. the act of excreting
- 17. gelatinous material between inner and outer body