Are fingerprints, irises and DNA immutable features in a person's life?

Yes! ! ! ! Fingerprints are ridges protruding from the epidermis. Because of human genetic characteristics. Although everyone has fingerprints, they are all different. Reaching out and observing carefully, we can find several types of small fingerprints: concentric circles or spirals, which look like eddies in water, called barrel lines; Some lines are open on one side, just like dustpan, called dustpan-shaped lines; Some lines are like bows, called bow lines. Everyone's fingerprints are different in shape, and the number and length of lines are also different. It is said that two people with identical fingerprints have not been found yet. Fingerprints begin to appear in the third or fourth month of the fetus and form around six months. When the baby grows up, the fingerprint just gets bigger and thicker, and its pattern remains unchanged. Fingerprint is a unique feature of human body. Fingerprint is not only unique, but also hereditary and unchangeable. Fingerprints are genetically influenced. Because everyone's genes are different, so are their fingerprints. However, although the formation of fingerprints is mainly influenced by heredity, there are also environmental factors. When the fetus develops in the mother's body for three to four months, the fingerprint has been formed, but the child's fingerprint will change slightly in the process of growth, and it will not be finalized until puberty is about 14 years old. In the process of skin development, although the epidermis, dermis and matrix layer all grow together, the soft subcutaneous tissue grows faster than the relatively hard epidermis, so it will generate a continuous jacking pressure on the epidermis, forcing the slow-growing epidermis to contract and collapse towards the internal tissue, and gradually bend and wrinkle, so as to reduce the pressure exerted by the subcutaneous tissue. On the one hand, it is hard to attack, on the other hand, it is forced to withdraw, which leads to uneven skin and lines. This process of bending and wrinkling fluctuates with the change of the upward pressure generated by the internal tissue, forming uneven ridges or wrinkles until the development process stops, and finally it is shaped into a fingerprint that will remain unchanged until death. Some people say that fingerprints will change after bone marrow transplantation, which is wrong. Fingerprints will not change, unless it is skin grafting or deep in the basal layer.