The phylum in which organisms contain a pseud | vedclass

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(D) The body cavity is a fluid-filled space between the body wall and the digestive tract. Based on the presence or absence of a body cavity (coelom),

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Nematoda

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(D) The body cavity is a fluid-filled space between the body wall and the digestive tract. Based on the presence or absence of a body cavity (coelom), animals are classified as acoelomates, pseudocoelomates, or coelomates. $1$. $Platyhelminthes$ are acoelomates (no body cavity). $2$. $Nematoda$ (roundworms) are pseudocoelomates, meaning they possess a false body cavity where the mesoderm is present as scattered pouches between the ectoderm and endoderm. $3$. $Annelida$ and $Arthropoda$ are true coelomates (possess a true body cavity lined by mesoderm). Therefore, the correct phylum is $Nematoda$.

The phylum in which organisms contain a pseudocoelom is

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