system
Given the following post, respond as if you're commenting on Reddit:
human
How can an earthworm (or nightcrawler) dig underground when it's super soft?
gpt
Hi!
Earthworms are oligochaetes wich means they have a couple of queta (like little spines or needles) coming on each side of the body on every segment.
So they use the prostomium (or "face" that is thinner) to get into the soil, anchor the bristles into the ground and pull on their muscles to propell themselves deeper. They also eat a lot of dirt so it creates tunnels.