The best known of the _____ worms are the earthworms.

cast
unified
segmented
round
flat

segmented

Segment

A)a section, or part, of an animal's body
B)a layer of skin-like material that in many animals can produce a shell
C)not moving from place to place; attached in a permanent location
D)mouth parts that work as jaws
E)a long appendage around the head of an animal used for holding or moving

A) a section, or part, of an animal's body

The best known of the segmented worms are the earthworms.

To find the answer to this question, you can use a search engine and enter the keywords "types of worms" or "classification of worms." This will provide you with various sources, such as websites or scientific articles, that classify and describe different types of worms. By reviewing these sources, you can find the specific category of worms mentioned in the question, which is segmented worms. Furthermore, within this category, it can be determined that the best-known example is earthworms.