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Across 3. what the flagellum is surrounded by 6. type of reproduction in sponges 7. inorganic skeleton 8. class of sponges with megascleres and microscleres; most common 9. how water moves through a sponge 10. glass sponges 11. exclude one or more descendants of an ancestor 13. collagen matrix giving sponge its shape 14. how classes of sponges are divided, based on... 15. one type of spomge shape 17. process that occurs when the organic part of a sponge is bleached 19. another type of sponge shape 20. class of sponges with spicules made of calcium carbonate

Down 1. first living organism 2. internal transport occurs by 3. contain an ancestral group and all of its descendants 4. inner layer of a sponge 5. a shared, derived character 9. derived from 2 or more distinct ancestral lineages; not ok 12. epithelial layer of sponges containing pinacocytes 16. most complex body form; chambered 18. cells arranged in simple sheets 21. central water chamber