Ancestral phenomenon

Returning to ancestry is a genetic phenomenon in which some organisms occasionally show certain traits of their ancestors. Is a less common biological ldquo; Degeneration rdquo; phenomenon. For example, the hind wings of diptera insects have generally degenerated into balance bars, but occasionally individuals with two pairs of wings appear. In humans, we occasionally see short-tailed children, long-haired people, women with nipples, and so on. These phenomena indicate that the ancestors of humans may be tailed, long-haired, nipple-like animals. So the phenomenon of ancestral return is also a kind of evidence of biological evolution.