best minds of antiquity and modernity have been and continue to argue about how one of the many planets in the universe was made possible the emergence of biological creatures.The fact that this issue - painful, evidenced by the numerous myths and legends, poetically describing the origin of life on Earth.Of course, since the days of ancient Egypt and Babylon took many centuries, mankind has accumulated significant baggage of scientific knowledge, but the question is still open.And the debate on this subject being still irreconcilable.
Despite the many different hypotheses, all of them can be grouped into three basic concepts of the origin of life : creationism and evolutionism theory of panspermia. Of course, it is quite conventional division within each of the concepts there are plenty of currents of dissent with each other.Also keep in mind that supporters of a hypothesis can accept the partial truth of other concepts.A few stand out the hypothesis of spontaneous generation of living things from inanimate nature, as well as the concept of biochemical evolution, expressed in the 20-ies of XX century Russian scientist A.I.Oparinym.
brief look at these theories.Creationism - without doubt the most ancient of them.He sees the origin of life on earth as God's creation process.The sacred texts of the religions of the world say that living beings, however, as the entire material world, were created by God or gods.In its fundamental course of creationism does not accept evolution and natural selection, believing that all beings were created only once and in the form in which appear today.But most of the adherents of the theory of the origin of life as an act of God's will partially recognize the theory of evolution of species.
At the time, Charles Darwin created a furore among his contemporaries, suggesting that the development of man and of all modern species of plants and animals have undergone the process of natural selection.The organisms were forced to adapt to changing environmental conditions and evolve.Thus, the origin of life on Earth to follow the path of development from simple organisms to more complex ones.If you continue with this theory of "deep", we must assume the existence of a "common ancestor" for all living things.
panspermia theory considers the origin of life on Earth as a result of entering the atmosphere from space on our planet protozoa.The hypothesis is based on the properties of some of the simplest cells successfully overcome such killer organisms for better conditions as close to absolute zero temperature, full vacuum and radiation.This concept is also a place for the doctrine that living organisms were deliberately left on the planet aliens, and that life originated at the same time the Big Bang - the beginning of the universe.
course, all the hypotheses about the origin of life on Earth have their "strong" and "weak" places.Completely it was refuted by a doctrine of samozarozhdayuschihsya beings (for example, used to think that flies are "born" rotten meat, and lice samozarozhdayutsya in dirty hair).The experiments of Louis Pasteur disproved this theory.So far yielded no results of laboratory studies, Oparin started and continued by British biochemist Haldane.These scholars argue that the simplest cell could have arisen by evolution of complex carbon compounds.
