A cell has a programming on how to divide. Sometimes, this programming goes bad. This happens a lot in the body, and there are other cells in the body that take those cells with bad peogramming out.
Sometimes, the body doesn’t recognise those cells. Then, they keep dividing and form clumps (tumors). When the cells stick together in a ball, its mostly good news, but when the cells start travelling trough the body, it’s harder to find and they will start this bad programming on other places as well, this is bad.
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