Two of the most important evolutionary developments in early hominids favoured by natural selection were encephalization and bipedalism.

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Encephalization refers to the increase in brain size relative to body size, which allowed for advanced cognitive functions. Bipedalism, the ability to walk on two legs, freed the hands for tool use and altered the hominids' view of their environment, both of which were significant evolutionary advantages.

Two of the Most Important Evolutionary Developments in Early Hominids