Once upon a time in a far-off land, there was a group of animals that lived together. They were all mammals and they learned to protect and adapt to their environment. One day, a scientist discovered something amazing about their genes. He found that some of the mammals had a special mutation that allowed them to breed better in certain conditions. This made these animals very special and they were carefully bred so that their special genes could be passed down to their offspring. Over time, these animals became stronger and better able to protect themselves from danger. The other animals in the group were amazed at how well these special mammals were able to adapt to their changing environment. And so, the story of the special bred mammals spread far and wide, showing that even the smallest change in a gene can make a big difference.
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