The $Osphradium$ of $Pila$ is:

The mollusc which is considered to be a living fossil and also shows characters of annelids like nephridia and internal segmentation is

Which of the following belongs to the class Gastropoda?

The eye of which molluscan group resembles the vertebrate eye?

The $Ink$ $gland$ is found in .........

In which group of molluscs is torsion a very important event in the life history?