Darwin's Theory of Evolution is the widely held notion that all life is related and has descended from a common ancestor: the dogs and the dingos, the cat and the bat are all related. Charles Darwin simply brought something new to the old philosophy which was a plausible mechanism called natural selection.
Darwin’s main ideas in his theory would be diverse groups of animals evolve from one or a few common ancestors and the mechanism by which this evolution takes place is natural selection. These ideas are related to each other as obviously as explained above that groups of animals evolve from their ancestors by natural selection. You could also say each unique organism has different advantages and disadvantages in the struggle for existence. Individuals best suited to their environment survive and reproduce most successfully. These organisms pass their heritable traits to their offspring's. Other individuals die or leave fewer offspring. This process of natural selection causes species to change over time.
Darwin's exposure to specimens all over the globe raised important questions. Other naturalists believed that all species either came into being at the start of the world, or were created over the course of natural history. In either case, the species were
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Seeing that individual differences of the same kind perpetually recur, this can hardly be considered as an unwarrantable assumption. But whether it is true, we can judge only by seeing how far the hypothesis accords with and explains the general phenomena of nature. On the other hand, the ordinary belief that the amount of possible variation is a strictly limited quantity is likewise a simple