Keber's organ is an associated part of which of the following?

The organism $Pila$ is an example of which class?

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

The connecting link between Annelida and Mollusca is......

In some molluscs,the rasping organ for feeding is called .........

Cuttlefish is a member of which phylum?