Answer :
This most likely happened because "Nature kills the weaker organisms and selects only the strongest organisms, which can survive and flourish" although it should be clear that nature didn't cause this mutation, is "chose" not to select it.
Answer:
Nature kills the weaker organisms and selects only the strongest organisms, which can survive and flourish
Explanation:
Natural selection is in charge of not allowing this kind of specimens to grow and reach adulthood, passing these undesirable treats to their offspring, in this way that race or species can start to eliminate that treat and have only the best suited individuals reproducing, upgrading the species.