Survival of the Fittest

When Charles Darwin was first coming up with the beginnings of the Theory of Evolution, he had to look for a mechanism that drove evolution. Many other scientists, such as Jean-Baptiste Lamarck, had already described the change in species over time, but they did not offer an explanation as to how that occurred. Darwin and Alfred Russel Wallace independently came up with the idea of natural selection to fill that void in why species changed over time.

Natural selection is the idea that species that acquire adaptations that are favorable for their environment will pass down those adaptations to their offspring. Eventually, only individuals with those favorable adaptations will survive and that is how the species changes over time or evolves through speciation.

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