GENERAL KNOWLEDGE

Detailed explanation-1: -The phenomenon of sudden reappearance of some ancestral features is called atavism. The appearance of ancestral characters in the newborn such as large canines, thick body hairs, short temporary tails, gill slits, additional pairs of nipples etc are examples of atavism.

Detailed explanation-2: -Human tails are a rare entity. The birth of a baby with a tail can cause tremendous psychological disturbance to the parents. They are usually classified as true and pseudo tails. [1] Tails are usually associated with occult spinal dysraphism.

Detailed explanation-3: -Why should a tail grow in a human embryo at all, only later todisappear? The explanation from science is that these are vestigesof tails that grew in nonhuman ancestors. On rare occasions, aremnant of the tail persists through embryological development, although this tail of course has no function.