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Biological chain

Biological chain – the natural way of movement of substances leading to receipt in live organisms in the environment; biological chains of harmful and radioactive materials have hygienic value.

 
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Even if heart of the person does not fight, then he all the same can live during a long period, as the Norwegian fisherman Jan Revsdal showed us. Its "motor" stopped for 4 hours after the fisherman got lost and fell asleep in snow.