Scientists usually try to reduce considered problems to possible to more simple things. In the last century it became clear to biologists that and a functional unit of any organism the cage is structural. it is final, at monocelled a cage - it and is an organism, but the multicellular condition means occurrence of new problems, such, as the organisation and differentiation, interaction and a competition of cages. and though any serious biologist not begins to assert that the understanding of events at cellular level is capable to give us full representation about an organism as a whole, almost all researchers agree what the cage is that logic starting point with which it is necessary to begin all-round studying of an organism.

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