Protohumans Appeared 4 Million Years Ago

Around 4 million years ago, the first “proto-humans” begin to be discernible. By 2.5 million years ago, they have increased body and brain sizes and are substantially upright.

The lineage was Australopithecus Africanus Australopithecus Africanus -> Homo Habilis Homo Habilis -> Homo Erectus Homo Erectus

Ref:

• [Guns, Germs and Steel](ref_guns-germs-and-steel-jared-diamond.md)❌