Question

Annelids and arthropods have segmented bodies. Still, they are kept in two different phyla. Why?

• A. Arthropods are triploblastic, annelids are not.
• B. Arthropods have jointed legs.
• C. The bodies of arthropods are bilaterally symmetrical.
• D. They can be grouped in one phylum as all the characteristics are the same.

Answer 1

Answer: (B)

Arthropods have jointed legs.

Both arthropods and annelids are triploblastic and are bilaterally symmetrical. But arthropods are characterized by the presence of jointed legs. This characteristic is not present in annelids. So, the arthropods and annelids cannot be kept under one phylum.

Therefore, the correct answer is option B.