List the main provisions of the theory of A.I. Oparin.

The main provisions of Oparin’s theory:
– life is one of the stages of the evolution of the Universe;
– the emergence of life is a natural result of the chemical evolution of carbon compounds;
– for the transition from chemical to biological evolution, the formation and natural selection of integral, isolated from the environment, but constantly interacting with it, multi-molecular systems are necessary.

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