According to Charles Darwin's theory of evolution by natural selection, organisms
that possess heritable traits that enable them to better adapt to their
environment compared with other members of their species will be more likely
to survive, reproduce, and pass more of their genes on to the next generation.
Evolution is the best way of understanding how human world changes.
Evolution brings implication of change that comes from within, rather than
being directed from without.
M. Ridley. 2015. The Evolution of Everything: How New Ideas Emerged.
New York, NY: HarperCollins Publishers