Your body is a an amazing machine that is built to repair itself very very well as long as it all the resources. However, it has to do this for decades. And the number of tiny cells in the body is in the trillions! So even with say accuracy rate of 99.9999% that’s a lot of cells that don’t act the way they are supposed to. Some group of cells are injured and not properly healed. Some turn cancerous and the other cells in the body stop them from spreading klby killing them. Some just lacked a certain nutritional component and years later are facing the impact. some just randomly misfire causing a spasm. Some random misfire is at nerves level too
And all this before realizing that the main mechanism the body has to replace the cells is by existing cells reproducing to fill in the void. The more often the body has to repair that part, the more chances it mutates unexpectedly.
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