Explain the theory of evolution proposed by Charles Darwin.

Dear student,

Charles Darwin was an English naturalist. He has greatly contributed to the field of evolution. Darwin proposed many theories and the mostly accepted theory of evolution is  

Theory of evolution by means of natural selection. Darwin and wallace proposed that natural selection is the mechanism by which new species arise from pre existing ones. Natural selection states that there is "struggle for existence" within a population and variation exists within all population. The continuous competition between individuals for environmental resources creates a 'struggle for existence' and this struggle makes sure that certain organisms would fail to survive or reproduce. This would eliminate less suited organisms and better adapted organisms would survive and pass on their traits to next generation leading to evolution. 

He also proposed the important theory of sexual selection, mechanisms for speciation etc.

Regards,