Across
- 1. use of tiny glass tubes to transmit light
- 6. mollusk with a merged head and foot and no outer shell
- 7. tiny cnidarians that grow a crusty shell around their bodies
- 12. organ that secretes a substance that forms a shell
- 14. a large collection of thousands of coral colonies connected together
- 15. animals with hollow bodies and stinging tentacles
- 16. two or more creatures living in a mutually beneficial way
- 17. decomposed material, fertilizer
- 18. the stage in a cnidarian's life when it has hollow body with tentacles
- 20. adult stage of a jellyfish's life cycle when it has a bell shaped body
- 21. a colony of cnidarians living together to form one organism
- 23. worm that thrives near hydrothermal vents
- 24. openings through which water enters the water vascular system
- 25. tubes that carry water to the rays of the starfish
- 27. study of living creatures for human technology
- 30. to regrow a lost body part
- 31. mollusk with one-part shell
- 32. mollusk with two-part shell
- 33. substance that turns bright red in the presence of oxygen
- 34. series of tubes that carry water throughout the starfish's body
Down
- 2. able to float
- 3. worm-like stage in a jellyfish's life cycle before it becomes a polyp
- 4. simple animal with many pores
- 5. end of a tubeworm's body
- 6. central canal pumping water to the ray canals
- 8. rows of tubes on the underside of each starfish ray
- 9. non-segmented worms with flat bodies
- 10. soft bodied invertebrate with a muscular foot and usually a shell
- 11. worm with rings or segments to its body
- 13. sea creature with spiny skin, often has five legs
- 19. non-segmented worms with round bodies
- 22. small openings or holes
- 26. a collection of thousands of coral connected together
- 28. process of converting chemicals to food
- 29. area on ocean floor where super-heated water flows out