The earthworm got its name from the habit of appearing on the surface of the earth after rain. The keen science writers, who carried the description of earthworms from book to book, argued that a worm can be cut into 10 parts, and a new creature can be recovered from each part. At some point in the descriptions, the number 10 doubled. And then it tripled. But these numbers are baseless.
Scientists have found that if you cut a worm in half, then under favorable conditions, only one of its halves can survive. This is due to the special structure of the worm's body. The body of the earthworm consists of annular segments, the number of which can reach 320. At one end, the worm has a mouth, at the other end, a tail. The organs of regeneration, allowing to recover from damage, are located between the 9th and 15th segments, counting from the head.
Thus, if the worm is cut, only its front part continues to live, provided that the organs of regeneration have not been cut off. And at the back in the dissected place, the wound is tightened and a so-called tail is formed, so that a “worm” appears without a head, but with two tails. Such a creature cannot feed, therefore it inevitably dies.
By the way, the earthworm reproduces exclusively sexually, then laying the formed eggs in a slimy cocoon. He does not have asexual reproduction.
In addition, the nervous system is well developed in the earthworm. Therefore, unlike insects, the worm is terribly painful if injured.