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Which one of the following statements about certain given animals is correct?

1. Round worms (Aschelminthes) are pseudocoelomates
2. Molluscs are acoelomates
3. Insects are pseudocoelomates
4. Flat worms (Platyhelminthes) are coelomates

Correct answer: Round worms (Aschelminthes) are pseudocoelomates

Solution

Roundworms (Aschelminthes/Nematoda) have a pseudocoelom, a body cavity not fully lined by mesoderm. The other options are incorrect because flatworms are acoelomates, molluscs are coelomates, and insects are also coelomates.

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