What is the difference between sessile and sedentary organisms?

''Sessile in zoology, describing an animal that remains fixed in one place . Sedentary animals , such as barnacles , limpets and muscles, are usually permanently attached to a surface . The term sessile is also used to describe the eyes of crustaceans that lack stalks and sit on the animal's head".
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organisms which are attached to a solid support ( sunstratum ) by the aboral surface and are called sessile .

sedentary organisms that do not move very much . filter feeding claims (not oysters ) and sea anemones , both of which they can move if they need to , but tend to stay in the same spot 
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(sunstratum ) *
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