Why we get old
Answer :
The main reason is because DNA replication. Our DNA is constantly copying it self in nearly every cell in our body. Each time this happens there is a change that a portion of the DNA will not be copy correctly. Year after years our cells will copy the wrong DNA code. And eventually our cells will not produce any more.
By example is like our computer is going breaks down after years and years after we use. there is many factors that make our computer broken.One of them maybe we never take care.
Some people say, it's natural cycle of life. So what we must to do is just enjoy our life and be the best
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