find out the origin of all life on earth - is a difficult task, on which humanity is struggling for a long time.There are many hypotheses on the theological (divine) to fantastic (the theory of a world alien beings).This is one of the most popular so far been proposed in the 19th century by Charles Darwin.Its essence lies in the fact that all species of life on Earth (including people) have appeared in the course of evolution, gradually taking its present shape.Some agree with this hypothesis, some do not, however, its importance for the whole of science as a whole is undeniable.
Summary of Darwin's evolutionary theory follows.All living species on the planet no one ever created.Organic forms that have arisen naturally, gradually changed in accordance with the conditions of their surroundings.At the heart of this transformation is heredity, variation and natural selection.Last Darwin was named as the struggle for existence.As a result of the evolution of a variety of different species appear in nature, thus they are maximally adapted to the environment in which they reside.
Summary of Darwin's theory described in his book, published in 1859.There scientist demonstrated how small changes in individual organisms lead to the transformation of livestock and crops.As a result, the person selects those species that are most valuable to him, and gets them to posterity.A similar process, scientists believe happens in nature.In his book The Origin of Species, Darwin describes as a long natural process, however, is absolutely not accidental.
Thus, volatility can be of two types: definite and indefinite.The first arises from the impact of external factors on the organism and, as a rule, if they disappear, the next generation of these features will not occur.Indefinite variability is inherited regardless of environmental conditions.That she is the driving factor for the development of species.
Summary of Darwin's theory is based on the fact that the material of evolution is a genetic variation.It leads to the fact that an individual appears successful or unsuccessful properties by crossing it with a closely related species.Modern biology has introduced called "mutations."
In the struggle for existence those organisms that have less adaptability to environmental conditions, either perish or less begin to multiply.The closer in structure to individuals who are in the same area, the more competition there is between them, with the result that many of them die.They survived mainly those who acquire different properties (they use a variety of food, protection, and so the attack. D.).As a result of the divergence (divergence symptoms) may occur splitting of one species to species that may eventually become an independent unit.
Summary of Darwin's theory suggests that the dwelling is in a stable environment leads to slower evolution.That is precisely the global climate change could cause the appearance of new species differs significantly from their supposed ancestors.Scientific results in a lot of evidence that it is natural selection determines the fitness of organisms to changing environmental conditions.For example, in animals is the color, in some plants and trees - the ability to reproduce by means of dispersal of seeds and fruits, and so on. D.
It should be noted that the basic tenets of Darwin's theory is quite important for the further development of science.His works are still being studied, it is held by a large number of studies and experiments.
