What makes a sea shell?

Answer 1

First of all, sand and most crustaceans don't make shells that become sea shells.

Sea shells are mostly made by molluscs, which include animals like clams, oysters, and snails. Other types of marine animals that make shells are echinoderms, such as sand dollars and sea urchins. Yet another type are known as brachiopods.

Molluscs build sea shells using a special part of their anatomy known as the "mantle" that deposits calcium carbonate that is removed from sea water or fresh water that the animal lives within. Some molluscs live on land as well.

The shell exists and grows for most of the life of the animal, often showing small growth rings, and is for the purpose of protecting the animal from predators and serves as an external skeleton during the animals life. When the animal dies, the shell remains, and large accumulations of these can become lithified (formed into rock) called limestone. The largest accumulation of carbon on Earth, contained in the calcium carbonate that makes these shells,
is within rock made from the remains of these once-living organisms.


Here is a good website that explains many types of molluscs:
http://www.mesa.edu.au/friends/seashores/gastropods.html

And another:
http://www.manandmollusc.net/

Answer 2

What Makes Sea Shells

Answer 3

Generally a Crustacean makes a sea shell with large amounts of calcium and sand found in the ocean. It becomes a sea shell once the Crustacean dies and it is washed ashore.

Answer 4

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Sea snails, it takes a long time to make them and I think some make them from proteins from their bodies and other use sand or both. They have a whole article on Wikkipedia about them.

Answer 5

conks , whelks, moon snails , oysters, clams ,helmet sanils just to name a few . All bivalves and mollusk. They are born with there shell and the shell grows as they grow they never leave there shell to find a bigger one . The one they are born with is the one they will always have

Answer 6

The organism that lived inside of it by using calcium and carbon and oxygen in the oceans to secrete calcium carboante shells.

Answer 7

physically? calcium from the creatures own system- the creature dies and other inhabitants move in eg hermit crabs

Answer 8

hard sand