In which triploblastic animal, coelom is absent?

Platyhelminthes

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Annelids

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Aschelminthes

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Arthropods

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Solution

The correct option is A
Platyhelminthes

In Platyhelminthes, endoderm, ectoderm and mesoderm are present. However, the mesoderm is present patched between the endoderm and the ectoderm, and it does not line the gut.

Suggest Corrections

(i)	Diploblastic :	Poriferans, Coelenterates
(ii)	Triploblastic :	Platyhelminthes to Chordates
(iii)	Acoelomata :	Poriferans, Coelenterates, Platyhelminthes
(iv)	Pseudocoelomata :	Aschelminthes/Roundworms
(v)	Eucoelomata :	Annelids to Chordates