Across
- 2. the phylum that includes pore bearing animals
- 8. the small calcareous or siliceous bodies embedded in the cells of invertebrates such as sponges
- 10. the resistant fibres of sponges
- 11. tube like cells of sponges that form a pore
- 12. animals that don't have a backbone
- 13. an organism that lives attached to a surface
- 14. the large opening of a sponge
- 15. also known as amebocytes, secrete the spicules and spongin
Down
- 1. the release of eggs, or gametes into the water
- 3. has no symmetry
- 4. a marked change in form during embryological development
- 5. animals that feed on particles suspended in the water
- 6. a type of suspension feeder that actively filters filters food particles
- 7. the flagellated, food cells trapping cells of sponges
- 9. free swimming larva inside sponges