Cancer
Healthy cells divide only when the body needs new ones and stop when the gap is filled. Over the years, a few mutations in one cell can break those brakes: the cell divides again and again although nothing needs it, and its offspring do the same, making a lump of cells. That is cancer. It is not catching, and many cancers can be treated if found early. It is more common in old age, as mutations build up; tobacco smoke, strong sun and some pollutants damage DNA and raise the risk, while not smoking, plenty of fruit and vegetables, exercise and shade lower it.
Depth 1 · Foundation
You can explain cancer as cells dividing out of control after mutations, say that it doesn't spread from person to person, and name things that raise and lower the risk.
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Foundation
You can explain cancer as cells dividing out of control after mutations, say that it doesn't spread from person to person, and name things that raise and lower the risk.
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