The osphradium of $Pila \text{ } globosa$ is

Most molluscs are

The connecting link between $Annelida$ and $Mollusca$ is:

The eye of which mollusc group resembles the vertebrate eye?

In which phylum is the body unsegmented with a distinct head,muscular foot,and visceral hump?

Open type of blood vascular system,presence of auricle and ventricle,and presence of haemocyanin respiratory pigment are the characters of