How are anelid worms adapted for digging?

Annelid worms, such as earthworms, are adapted for digging through their segmented bodies, which allow for flexible movement and the ability to contract and expand. Their moist skin facilitates gas exchange and aids in burrowing, while bristle-like structures called setae provide grip and traction in the soil. Additionally, the muscular structure of their bodies enables them to push through soil effectively, creating tunnels that improve soil aeration and nutrient distribution.