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The  human body replaces itsself every 7- 10 years and sometimes often. There are over 75 trillion cells in the body. Organs like the intestines, skin, liver and bones all replace themselves whether its every few years or weekly. The most important cells replace themselves faster. we all may have the questioned why the body replaces itself or how the body replaces itself. The body makes new cells in different ways. one way is by a process called mitosis, when a parent cell splits into two new cells and those cells are called daughter cells which are copies of the original cell. Another way the body replaces itself is stem celling. They are usually in the lowest amount. Cells like blood cells and nerve cells can not make copies of themselves. When you are born with spaces between your hands and feet is caused due to cells dying preventing you from having webbed hands and feet like some animals. All cells eventually shrivel up and die. Skin, the epidermis goes through a lot of wear because it is the outermost layer of the body it protects. Skin cells renew themselves every two to four weeks. Hair has a life span of 6  years for women and 3 years for men. The liver is the human body detoxifier aided in the process of blood supply constantly. renewing every 150 to 500 days due to the immune damage. The stomach and the intestine have a difficult short life renwal lasts up to 5 days.