Out of the trees and into the fields.
Possibly world climactic changes and the resulting diminished forests prodded some tree dwelling primates to adapt to plain environments.
Here, the ability to easily stand on one's hind legs to see above the tall meadow grasses, had survival value. This perhaps also gave extra freedom to the hands which could then be used more readily to develop tools.
This in turn would have stimulated brain growth and improved the thought processes--powerful survival assets in a world filled with eminent and fatal dangers.
Click on the Notes below for more related information. Materials found in the notes throughout these lectures, however, is for interest purposes only and will not be included on any of the tests.
Notes: Some interesting facts on early humans evolvement.
Notes: Some more interesting facts on early humans evolvement.