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This lesson covers evolution by natural selection — the mechanism by which species change over time — as required by the Edexcel GCSE Combined Science specification (1SC0). You need to understand Darwin's theory, the process of natural selection, speciation and the evidence for evolution.
Evolution is the gradual change in the inherited characteristics of a population over many generations. Evolution may lead to the formation of new species — a process called speciation.
Evolution occurs because of natural selection — a process first described by Charles Darwin following his voyage on HMS Beagle and his observations of finches on the Galapagos Islands.
Darwin's theory can be summarised in the following steps:
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