Annelids have segmented bodies with powerful muscles, a one-way gut that runs through the body, a circulatory system and nervous system.
Annelid Animation: Body Plan
Next Generation Science Standards for this Video
The segmented body plan of an annelid worm with both circular and lengthwise muscles is the ideal structure for active burrowing. A one-way gut runs through the body, and they have both a circulatory system and nervous system.