by etsuko.nakamura
Question by tdiarocks123: How do people know what causes caner?
I'm asking this because if they know what can be a risk of cancer such as cigarettes, then how do they still not know how it starts?
Best answer:
Answer by David MillershipCancer is caused by the breakdown or change of DNA in a cell which causes it to be 'abnormal' or basically it just doesn't do what it's meant to. If the cell is malignant it then goes on to reproduce, or make copies, of itself ( we
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