Which phyla lack organs? what kind of the symmetry do they, Ask an Expert

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1) Which phyla lack organs? What kind of the symmetry do they have?

2) State all of the phyla which show cephalization?

3) Do all the organisms on table have three germ layers (endoderm, ectoderm and mesoderm)? If not, which phyla have fewer that three germ layers?

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Biology, Academics

Category:- Biology
Reference No.:- M9163806

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