Shells
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Shellfish are aquatic animals including soft-bodied animals (molluscs). In the broadest sense, shellfish means all molluscs with a pair of shells,With this understanding, it is more appropriate to call it shellfish and commensurate with the meaning of clam used in America. Examples of such usage can be seen in the term "craft from shells".
The word shellfish can also mean all the shells that live attached to an object. These include edible species such as shellfish and green shell (kupang awung), but do not include edible species but are lying on sand or aquatic base, such as lokan and mussels. The shrimp is also used to name various shellfish -shell-shelled, calcareous, with a radial pattern on a firm shell. In this sense, green shells are not included and more properly called kupang,In the most narrow sense, what is referred to as mussels are blood clams (Anadara granosa), a type of common cultivation shells found in the Indo-Pacific region and sold in many stalls or restaurants selling seafood.
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All shells have a pair of shells (also called grafts or valves) which are usually symmetry of a mirror connected to a ligament (connective tissue). In most shells there are two adductor muscles that regulate the open-lid of the shell.
Shells have no head (also brains) and only the eyebrows have eyes. The organs are kidney, heart, mouth, and anus. Shellfish can move with "feet" in the form of a flattened organ expelled from the shell at any time or by opening the lid of the shell in a shock.
The circulation system is open, meaning it has no blood vessels. The supply of oxygen comes from the very liquid blood that is rich in nutrients and oxygen that surrounds its organs.
Food shells are plankton, by means of filtering. The shell itself is a prey for squid and sharks. All shells are male when young. Some will become females along with maturity.
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