Darwin’s theory

Pasteur’s simple and remarkable experiment put a definite end to all controversy among abiogenesis and biogenesis believers, but new questions about life’s origin arose. If to create a living being there had to be another living being, who created the first one? Furthermore if an organism creates only identical beings, how can it be that on Earth one can find such a large variety of living beings? Fortunately the fossils that were found and Darwin’s theory on evolution are able to give some answers to these new questions. In fact, according to the English naturalist, in fact, fossils prove that ancient living organisms were different from present day ones and according to the evolution theory individuals within a same species that have minor differences from one another (such as in the case of man, where there are people with light blue eyes, others with brown ones etc..). When the surrounding environment changes, individuals that have better characteristics to adjust to new conditions, are those that will survive and generate new living beings with similar features to theirs, while others less adapted will be extinguished before being able to reproduce. Consequently, the better adapted individuals, through the natural selection of the best characteristics, will create individuals with even better ones.
Darwin believed that all species alive nowadays descended from a single common ancestor and thanks to the natural selection they were able to create new organisms that adapted to the requirements of an ever changing environment.

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