Across
- 2. aperture
- 6. reproductive
- 8. bricks
- 9. openings
- 12. mucous
- 14. individual
- 16. canals
- 17. collagen
- 18. spongebob
- 21. ctenophores
Down
- 1. contract
- 3. undergo
- 4. jellyfish
- 5. flagellated
- 7. stuck
- 10. asexual
- 11. sexual
- 13. microscopic
- 15. cavity
- 17. sycettidae
- 19. bottom
- 20. filtering