Secondarily asymmetrical type of symmetry is present in

  • A
    Unio
  • B
    Snail
  • C
    Holothuria
  • D
    Star fish

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Which of the following classes does not belong to phylum $Mollusca$?

The $Osphradium$ of $Pila$ is:

In $Mollusca$,the eye is present over a stalk called:

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