Can DNA change over a person's lifetime?

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i thought i got some refused thing.can DNA change?if they cannot change, why we don't like as a cave dweller or like a monkey?i mean the body .
 
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You need to make your question more clear, as I cannot understand what you are asking.
 
when before stone age,the human beings are like as a gorilla. i mean their appearance , using four legs to move ...etc... but now we have got changes . we have a big brain, use two legs to walk . so is it relating the changes of DNA,or others?
 
Changes (mutations) in the DNA sequences will give rise to the differences you observe between two species.