animals with 2 layered body wall enclosing a single cavity opening on one sidde only are one of the charecteristics of which phylum???
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Expert's answer
2014-02-26T02:56:49-0500
These features are characteristics of the phylum Cnidaria and phylum Ctenophora. Their body wall consists of an ectodermal and an endodermal layer, sometimes with a jelly-like substance called mesoglea in between.
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