Platyhelminthes are acoelomates because:
Athey lack all three germ layers
Bthey are diploblastic
Ctheir mesoderm forms a solid mass and does not split to form a body cavity
Dthey have a body cavity lined by mesoderm on both sides
Answer & Solution
Correct answer: C. their mesoderm forms a solid mass and does not split to form a body cavity
Platyhelminthes are triploblastic, but the mesoderm remains solid and does not split to create a coelom. Therefore they are acoelomate, not diploblastic and not true coelomates.
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