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aquatic, mostly marine
first group of animals to achieve...
tissue level of organization
- embryonic tissue
- ectoderm (outer skin)
- endoderm (inner skin)
- use cnidocytes (venom containing cells) to capture prey.
2 body formss
Polyp- attaches to a surface and has tentacles pointing upward
medusa- jellyfish, free swimming, tentacles pointing downward
- venom containing cells capture prey
- use stinging filament nematocyst which shoots out from the cell at the slightest touch, to inject venom into prey
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