Earthworms have tiny bristles called setae which usually stay inside of their bodies. They can, however, jab them into the surrounding dirt to help them move forward. What is another way that earthworms often use their setae?
A.
to glide along the surfaces of water bodies
B.
to help oxygen diffuse through their skin better
C.
to anchor themselves to the ground when a bird tries to pull them away
D.
to help push dirt in their mouths when eating