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Charles Darwin was an English graduate educated and trained in the disciplines of natural history.Such natural historians would collect, catalogue, describe and study the vast collections of specimens stored and managed by curators at these museums.
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In contrast to genetic drift, natural selection is not a random process because it acts on traits that are necessary for survival and reproduction.
The modern understanding of evolution began with the 1859 publication of Charles Darwin's On the Origin of Species.
Genetic changes include mutations, which are caused by damage or replication errors in organisms' DNA.
As the genetic variation of a population drifts randomly over generations, natural selection gradually leads traits to become more or less common based on the relative reproductive success of organisms with those traits. during the Eoarchean Era after geological crust started to solidify, following the earlier molten Hadean Eon.
The forces of evolution are most evident when populations become isolated, either through geographic distance or by other mechanisms that prevent genetic exchange.