Across
- 3. where cnidarians live
- 5. how many directions does water move in a sponge
- 7. skeleton on the outside of the animal
- 10. help move water through the sponge
- 12. carry food to cells of the sponge
- 15. rubbery material that makes up spicules
- 17. animal without a backbone
- 19. sponges are classified in this phylum
- 20. the number of layers a sponge has
Down
- 1. animal with a backbone
- 2. shape of a sponge
- 4. skeleton on the inside of the animal
- 6. umbrella form of a cnidarian
- 8. an invertebrate animal with stinging cells
- 9. cuplike form of a cnidarian
- 11. invertebrate animal with pores
- 13. cnidarians use these to capture prey
- 14. hard needle-like structure in sponge
- 16. tiny openings
- 18. a type of cell that makes up the inner layer of a sponge