Many people are interested in shell, they come from Sea, and shells come in many shapes and sizes. They can be found along shorelines or in the depths of the ocean.
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Type of shell
2010-06-12 17:30:00
Shells have many sizes, the smaller shells move along with the waves and currents and often wash up on the beach. Each type of shell has unique features and each type serves a different purpose.
1. About its function, because human bodies have a skeleton to protect the internal organs from damage,the mollusks, a class of marine creatures, have external shells to offer them the same protection. They act as disguise to hide the mollusks from their predators by offering a hard protective armor that's hard to bite through. The shell also protects the sea living beings from being thrown around by ocean currents and bad weather. They're made from calcium, just like human skeletons.
2. About the type of shell, univalve or gastropods are one-piece, swirl-shaped shells. They do not have hinges and aren't attached together. Bivalve shells are attached to other parts. They have two matching halves, though tides and waves often break them apart. Some of the most common shells are the spiral-shaped whelks, miniature clam-shaped shells called coquinas, and the long, tube-shaped small jackknife clam.
3. The size of shell, the largest univalve shell can grow to be more than 28 inches long, but most univalve shells are smaller. They are usually less than 7 inches long. The largest bivalve found was almost 6 feet wide.
4. About the features, if a shell appears to have a hole in it, the shell likely was attacked by a predator. Some birds have beaks that will peck through the hard shell, allowing the bird to eat the soft mollusk that resides inside.
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