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Animals possessing a body cavity (coelom) LINED BY MESODERM are called:
ACoelomates (e.g. annelids, molluscs, arthropods, echinoderms, chordates)
BPseudocoelomates
CSessile animals
DAcoelomates
Answer & Solution
Correct answer: A. Coelomates (e.g. annelids, molluscs, arthropods, echinoderms, chordates)
Coelomates have a true coelom — cavity lined by mesoderm. Pseudocoelomates (Aschelminthes) have scattered mesoderm pouches, not a continuous lining. Acoelomates (Platyhelminthes) have no body cavity at all.
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