Submitted by emelrad12 t3_zhujsn in askscience
FogeltheVogel t1_izp3g5s wrote
Reply to comment by Galaxy-Hitchhiker42 in How did viral DNA become part of the human genome? by emelrad12
Copying DNA is not a perfect process. Mutations naturally occur every now and then.
There's no particular cause, mutations are just a fact of life.
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