A retractable foot, a siphon for sucking up water, powerful muscles, and, sometimes, a pearl ... and mussels, clams are bivalves, a kind of mollusk that's encased in a shell made of two valves ...

Oysters are the primary producers of pearls, clams and mussels can also create ... Oysters are bivalves that means their shell is composed of two valves connected by an elastic ligament.

A: The shell or clam shell has symbolic value in many cultures ... portal of the Pisa dome where the Annunciation is accompanied with the symbol of shell and pearl, titled Rore coelesti foecundor ...

Nacre (mother of pearl) is an elaborate combination of aragonite ... Molds may be external - of the exterior of the shell, as on the slab of snail and clam external molds. If a shell fills with ...

Pearls are made by marine oysters and freshwater mussels as a natural defence against an irritant such as a parasite entering their shell or damage to their fragile body. The oyster or mussel slowly ...

These translucent animals are known to swim inside clams and oysters to hide from ... that are in its calcium carbonate shell, the mollusc creates a material called nacre, commonly known as ...