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a
Coelenterata
b
Platyhelminthes
c
Annelida
d
Aschelminthes
answer is A.
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Detailed Solution
Coelenterates are diploblastic animals in which the cells are arranged in two embryonic layers, an external ectoderm and an internal endoderm. Higher animals (Platyhelminthes to Chordata) are triploblastic animals in which the developing embryo has a third germinal layer, mesoderm, in between the ectoderm and endoderm