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According to Charles Darwin, evolution is "descent with modification". A more modern definition is: change in genetically determined characteristics of populations. The process is driven by natural selection. A classic example is that of the Peppered Moth (Biston betularia) of Britton.
Evolution is where living things gradually change over time to become better suited to an ever-changing environment to ensure survival. Darwin was the man who brought this out into the lime-light.
An example of evolution is when scientist study the fossil-record and studying the genetics of living organisms dating back to around 3 and 1/2 billion years ago.
Nowadays, the accepted definition would be a bit more technical and goes :
evolution is the change in allele frequency in a population, over time.
Basically, it's characteristics (beneficial and detrimental) which occur more (or less) in groups as generations come and go.
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