In which of the following phylum, would you place an animal with a bil

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In which of the following phylum, would you place an animal with a bilaterally symmetrical, triploblastic body without a true internal cavity (coelom) ?

Porifera
Platyhelminthes
Cnidaria
Annelida
This question was previously asked in
UPSC CAPF – 2020
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An animal with a bilaterally symmetrical, triploblastic body without a true internal cavity (coelom) would be placed in the phylum Platyhelminthes.
Phylum Platyhelminthes (flatworms) are characterized by bilateral symmetry and being triploblastic (having three germ layers: ectoderm, mesoderm, and endoderm). They lack a true coelom, meaning they are acoelomate – the space between the body wall and the digestive tract is filled with mesodermal tissue.
A) Porifera are asymmetrical or radially symmetrical, and diploblastic. C) Cnidaria are radially symmetrical and diploblastic. D) Annelida are bilaterally symmetrical and triploblastic, but they possess a true coelom (they are coelomates).

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