The locomotory organs of Echinoderms are called

Which of the following systems is found in echinoderms?

Most advanced molluscs belong to the class

Devil fish is the common name of

Shipworm is

The largest Invertebrate is

Which of the following produces a shell of great ornamental value

‘Pearl mother layer’ is

Pearls of commercial value are produced by which of the following genera

Ink glands as a means of escape from predators are present in