[Ontogenetic characteristics of the body response to chronic exposure to chemical substances].

Chronic intoxication by carbon oxide and long-term exposure to hypoxic hypoxia produced more favourable reactions in animals, exposed to these in the early terms of ontogenesis. The observed regularity was not found under chronic exposure to styrene and epichlorohydrin ++. A supposition is made on the evolutionary predetermination of this effect pertaining to unfavourable factors of hypoxic nature.