You find a new species of worm and want to classify it. Which of the following lines of evidence would allow you to classify the worm as a nematode and not an annelid?

A) It undergoes protostome development.

B) It is segmented.

C) It is triploblastic.

D) It has a coelom.

E) It sheds its external skeleton to grow.

The correct answer is: E) It sheds its external skeleton to grow.

Nematoda and Annelida re both types of worms but with huge difference in their body structure: at Nematoda has a cylindrical body with tapered ends (roundworms) that is covered with tough cuticle while Annelida has a cylindrical segmented body (segmented worms). Another difference is that Nematoda has a pseudocoelom while Annelida has a true coelom. Nematodes are usually parasites of plants or animals while most annelids are free-living organisms that live in the soil.