Which of the following phyla lacks a coelom?

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(A) The coelom is a fluid-filled body cavity that is completely lined by mesoderm. $1$. $Platyhelminthes$ (flatworms) are acoelomates,meaning they lac

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Platyhelminthes

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(A) The coelom is a fluid-filled body cavity that is completely lined by mesoderm. $1$. $Platyhelminthes$ (flatworms) are acoelomates,meaning they lack a body cavity. $2$. $Annelida$,$Arthropoda$,and $Echinodermata$ are all coelomates,meaning they possess a true coelom. Therefore,the correct answer is $Platyhelminthes$.

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