QuestionMarch 19, 2026

Which group(s) has a pseudocoelom? flatworms sponges jellyfish roundworms vertebrates

Which group(s) has a pseudocoelom? flatworms sponges jellyfish roundworms vertebrates
Which group(s) has a pseudocoelom?
flatworms
sponges
jellyfish
roundworms
vertebrates

Solution
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Answer

Roundworms Explanation 1. Identify definition of pseudocoelom A pseudocoelom is a body cavity between the mesoderm and endoderm, not fully lined with mesoderm. 2. Determine which groups have pseudocoelom Roundworms (phylum Nematoda) possess a pseudocoelom; all others listed lack it—flatworms are acoelomate, sponges have no tissues, jellyfish are diploblastic, vertebrates are coelomates.

Explanation

1. Identify definition of pseudocoelom <br /> A pseudocoelom is a body cavity between the mesoderm and endoderm, not fully lined with mesoderm. <br /><br />2. Determine which groups have pseudocoelom <br /> Roundworms (phylum Nematoda) possess a pseudocoelom; all others listed lack it—flatworms are acoelomate, sponges have no tissues, jellyfish are diploblastic, vertebrates are coelomates.
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