Multiple choice

Which of the following is a common characteristic between flatworms and roundworms?

  1. Triploblastic

  2. Acoelomate

  3. Pseudocoelomate

  4. Parasitic
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A Correct answer
Explanation

Both flatworms (Platyhelminthes) and roundworms (Nematoda) are triploblastic, meaning they develop from three germ layers: ectoderm, mesoderm, and endoderm. Flatworms are acoelomate (no body cavity), while roundworms are pseudocoelomate (false body cavity), so these features differ. Not all members of either group are parasitic.

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