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Chemists have shown that a necessary condition of vital activity of theanimals known is the oxidation of substances in the body composition.The oxygen required for this oxidation is in the environment inthe water or the air. If the body - some small, simple, alreadyone contact its outer surface with the medium containingoxygen, enough provides the necessary oxidation; ifthe body is bulky and is of small surface relatively to ground, thenin this way it is impossible to provide any significant oxidation.You need to assume that either of two things: either this voluminous body, gettingthe oxygen only through the shell, must have a miserable lifeactivity; or, if he has a lot of life activities, must be some vast, diverging, surface, internalor outdoor, to which the air would have appropriate access needs to bethe breathing apparatus. Therefore, the existence of lungs, gills or theirequivalents can be predicted a priori all the active creaturesany size.
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