What features separate Poriferans from cnidarians?

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Tags

1. #corrals
2. #poriferans
3. #phylum
4. #sponges
5. #porifera
6. #sessile
7. #always
8. #organisms
9. #multicellular
10. #aquatic
11. #known
12. #animal
13. #living
14. #while
15. #jellyfishes
16. #cnidarians
17. #example
18. #simple