Multiple choice

Name the phyla of segmented worms.

  1. Annelida

  2. Arthropoda

  3. Platyhelminthes

  4. Nematoda
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Explanation

Annelids (segmented worms) are characterized by their body segmentation, with repeated segments containing similar organ systems. Earthworms are the classic example, showing visible external rings (annuli) that mark each segment. This metamerism is a key evolutionary innovation allowing for specialization of body regions. Arthropods are also segmented but have jointed appendages, while other worms listed lack true segmentation.

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