The most ancient branch point in animal phylogeny is that


The most ancient branch point in animal phylogeny is that between having

a) radial or bilateral symmetry
b) a well-defined head or no head
c) diploblastic or triploblastic embryos
d) true tissue or no tissues
e) a nody cavity or no body cavity

please answer with explanation.

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Biology: The most ancient branch point in animal phylogeny is that
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