In which of the following is the body cavity surrounding the alimentary canal not lined by a cellular layer?

  • A
    Nematodes
  • B
    Platyhelminthes
  • C
    Annelids
  • D
    Echinoderms

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The $Aschelminthes$ are commonly called roundworms because:

$A$: In $Aschelminthes$,the young ones resemble the adults.
$R$: Indirect development is observed in $Aschelminthes$.

In which of the following animals is a pseudocoelom found?

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