How are adaptations related to natural selection?

Answer:
Natural selection means that only the fittest survive. The fittest are usually defined as those with the characteristics, or adaptations, that allow them to survive longer in a certain environment. In this way, they are selected by nature to reproduce and pass those adaptations on to their offspring, while animals who are not able to adapt or lack the necessary qualities to survive will die without reproducing, thus eliminating their genes from the gene pool. The idea is that eventually, you will end up with a population where only certain adaptations that are perfect for surviving in the given environment are present.
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