The litre (International spelling) or liter (American spelling) (SI symbols L or l, commonly abbreviated as ltr) is an SI accepted metric system unit of volume equal to 1 cubic decimetre (dm 3), 1,000 cubic centimetres (cm 3) or 1/1,000 cubic metre.
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The water vascular system of the starfish is a hydraulic system made up of a network of fluid-filled canals and is concerned with locomotion, adhesion, food manipulation and gas exchange. Water enters the system through the madreporite, a porous, often conspicuous, sieve-like ossicle on the aboral surface.bout 1,500 species of starfish occur on the seabed in all the world's oceans, from the tropics to frigid polar waters. They are found from the intertidal zone down to abyssal depths, 6,000 m (20,000 ft) below the surface.