What happens when an earthworm is cut in half? Can it
form two separate worms as would appear? Can each half then go on to
reproduce and complete its life cycle?
Most of the organs of an earthworm are in the "top half". If you look at a
worm, there is a band going around it about 1/3 of the way down from one
end. That end is the "top" of the worm. When a worm is cut in half it can
regenerate a new tail, but the other half can't regenerate a new head. So,
no, you don't get two new worms.
Click here to return to the Zoology Archives
Update: June 2012