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- Evolution refers to gradual and orderly biological changes that result in a species from their pre-existing forms in response to their changing adaptation demands of their environment.
- Physiological and biological changes that take place as a result of evolutionary processes are so slow that they become visible after hundreds of generations.
Three important features of modem human beings include:
- A trigger and developed brain with increased capacity for cognitive behaviours (like perception, memory, thinking, reasoning, etc).
- Ability to walk upright on two legs and
- Free hands with a workable opposing thumb.
The environmental demands had to biological and behavioral changes over a long period of time. In the human brain, the earliest to the most recent structures in the process of evolution are: Limbic system, brain stem and cerebellum are the oldest; and cerebral cortex is the latest developed.