Which scientist is the author of the theory of evolution by natural selection?

This is Charles Darwin. The ego theory of evolution has proven to be very accurate and has been confirmed through tens of thousands of finds, many experiments and genetic studies. Darwin identified three forms of struggle for the existence of organisms. This is a struggle with representatives of their own species for food, sexual partners and better living conditions. The second form of struggle is struggle against other species. The third form of struggle is the struggle against environmental and natural conditions. This struggle constitutes natural selection, since weak and unadapted organisms die.