A clam shell is not smooth because being smooth would decrease friction between a clam and the surface it lives on. With low friction, a clam would go places it would not want to go.
The inside lining of a clam shell is called a nacre. It is soft and smooth and helps protect the clam.
A clam shell
Possessive form of the words clam shell: clam shell's
A clam shell is typically oval-shaped with two hinged halves that can open and close. It is usually smooth and symmetrical. Clam shells can be distinguished from other types of shells by their shape, hinge, and lack of prominent ridges or spikes.
The outside layer of a clam shell is the periostricum. The middle layer is the prismatic layer. The inside layer is the nacreous layer.
The mantle of a clam protects the clam from sunlight in shelled mollusks, the mantle is the organ that forms the shell, and adds to the shell to increase its size and strength as the animal grows.
A clam. Or an oyster.
The shell of a clam is primarily made of calcium carbonate. This compound gives the shell its hardness and strength to protect the soft body of the clam.
A clam shell grows via a process where tissue is attached to the shell at the edge. Over time this material builds up producing a ring like pattern. The number of rings will indicate the age of the clam shell.
The largest shell in the Philippines is the Tridacna gigas, also known as the giant clam. It can grow up to 4 feet in length and is a protected species due to its status as an endangered marine organism.
Only if you poo on it
By it's shell