not only and spread, it also . We will see many changes as we follow the story of life. How did these changes happen?
We normally think of mistakes and accidents as bad. But sometimes they are good. Our own mistakes give us the chance to learn, to discover something new. So it was with life.
Mistakes sometimes happened when reproduced.
A of one could be changed into another base. These mistakes are called mutations. They could be caused by , by harmful chemicals or by in the .
The two genes which grew upon these two halves were different from each other. They carried for different .
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