How do worms split?

Worms, particularly earthworms, can reproduce through a process called fragmentation, where a part of the worm's body can regenerate into a new individual. However, this is not a common method of reproduction for most species; instead, many worms reproduce sexually by exchanging sperm with another worm during copulation. After mating, they can produce a cocoon containing fertilized eggs. In some cases, if a worm is cut into pieces, each segment may regenerate into a new worm, but this ability varies among different species.