Australopithecus gave rise to the genus Homo about 2.5 million years ago for the following likely reason:

Question

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Sudden climate change is considered a likely reason for the emergence of the genus Homo from Australopithecus around 2.5 million years ago. Changes in the environment would have necessitated adaptations that led to the development of traits characteristic of Homo, such as increased brain size and the use of tools.

Australopithecus Gave Rise to the Genus Homo About 2