Multiple choice

In contrast to Annelids the Platyhelminths show

  1. absence of body cavity

  2. presence of pseudocoel

  3. radial symmetry

  4. bilateral symmetry
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A Correct answer
Explanation

 In contrast to Annelids the Platyhelminths show absence of body cavity. They are acoelomates (having no body cavity), and have no specialized circulatory and respiratory organs, which restricts them to having flattened shapes that allow oxygen and nutrients to pass through their bodies by diffusion.

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