If an earthworm cut in half - do not get two live worm is a myth

Many childhood confident that if an earthworm divided in two halves, you get two worms. If you ever checked it, you probably have been disappointed.

The fact that the head and tail of the worm differ significantly in structure and in their biological functions. Having carefully considered the worm, near one end you will find a thickening, called fascia. It was on the other end, which is closer to the belts, and is the head of the worm.

If you cut a worm in two parts so that the belt stayed on the segment with the head, that part will be able to survive and grow yourself a new tail. But the new head and the other vital organs of the old piece of the tail can not be restored - this part of the worm will inevitably perish.



There is another kind of worms are capable of regenerating the body to a large rain head start - the planarian flatworms. These tiny invertebrates are able to fully recover from a piece the size of 1/300 of the entire body. According to a study published in the July issue of the "Journal of Experimental Biology" for the 2013th year, when a new planarian head grow to replace the lost, they miraculously recover all the old experience and "memories" contained in the old head.

via factroom.ru