A boy was born with 5 pairs of nipples. How can the occurrence of this developmental anomaly be explained?

Multi-nipple is due to the development of all glands of the milky lines, which are laid in embryogenesis. Apparently, there is a violation of the reduction processes in the embryonic epithelium of the glands. As a result, the glands develop. The preservation of these structures in the postembryonic period is an atavistic sign that proves the unity of the origin of humans and animals.

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