EVOLUTION RESTS ON three steps: {a} certain biological traits are inherited by genetic means; {b} mutations and gene recombination produce variation in those traits; {c} some of those variants confer more "fitness" than others. Given those conditions, over time the frequency of more "fit" gene variants increases in a population.
( Robert M. Sapolsky )
[ Behave: The Biology of Humans ]
www.QuoteSweet.com