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Coelomate means body cavity which is required for packaging complex organs in the body design for eg. annelids have a coelom.aceolomate is when organism does not consist body cavities because of their simple body design for eg. in poriferra,coelenterata and plathyhelminthes etc....
Some primitive animals survive without a body cavity. These animals are called acoelomates
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Simply acelomate means not having ceolm