HUMAN BODY A WONDERFUL MACHINE

Evolution involves the gradual changes from simple to more complex forms. Humans are believed to have developed from simpler forms. Evolution is hypothesized to have begun in the oceans billions of years ago. Darwin gave the theory of evolution. In his book -The Origin of Species Darwin has stated that evolution has come through a series of natural selection. The theory emphasized the following points: Natural Selection. Variation. Struggle to Exist. Survival of the Fittest. Evolution is the outcome of the interaction amongst the following five processes: Mutation. Genetic Recombination. Chromosomal Abnormalities. Reproductive isolation. Natural Selection. Stages in Human Evolution.