Evolution

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Horse - Evolution, Domestication, Anatomy | Britannica
As horses evolved, they increased in size and lost all but one of their toes on each foot. The earliest horse was the dawn horse (Hyracotherium or Eohippus). Przewalski’s horse, a subspecies of the modern horse, is believed to be the last surviving horse to have evolved through natural selection rather than through domestication by humans.
Natural Selection
Charles Darwin and Alfred Russel Wallace's theory explains how evolution occurs. Individuals naturally vary in traits in a population. With limited resources, competition exists in which those better adapted - with beneficial traits suited to the environment - are more likely to obtain resources, survive, reproduce, and pass traits to offspring over successive generations. This natural selection of advantageous traits leads species to evolve over time.