Phylum consists of organisms which do not have a coelom.
A
Mollusca
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B
Aschelminthes
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C
Platyhelminthes
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D
Echinodermata
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Solution
The correct option is C Platyhelminthes Coelom or body cavity is absent in the organisms belonging to Phylum Platyhelminthes. Such organisms are called acoelomates. Phylum Aschelminthes consists of organisms which have a pseudocoelom. All higher phyla have true coelom in their body and are called coelomates.