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only for cnidaria and playhelminthes
separate mouth and anus
everything after Annelida
- Absent- Porifera, Cnidarians, Platyhelminthes, Mollusca, Nematoda, Echinodarmata
- Present- Annelida, Arthropodsa,
Endoskeleton- Porifera, Echinodermata
Hydrostatic- Cnidarians, Platyhelminthes, Annelid, Mollusca, Nematoda,
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