British biologist Charles Darwin proposed the theory of evolution based on the process of natural selection.
It refers to Darwin's belief that natural selection is the key cause of evolution.
Darwin proposed that genetically distinct species could evolve from a common ancestor by natural selection.
This involves the selection of a particular trait that allows an organism to develop characteristics that enable its survival in the changing environment.
The ability to survive change provided these organisms with adaptability that forms the crux of successful evolution.
This ensured that only the fittest organisms, capable of adapting to change were selected by nature as pioneers of evolution.