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Atavism

Atavism (atavismus; lat. atavus – the remote ancestor) – emergence in descendants of signs who are absent at the closest ancestors, but are inherent to the remote ancestors. Atavism, as a rule, arises because of disturbance of embryonic development.

 
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Many drugs initially moved ahead in the market as drugs. Heroin, for example, was initially brought to the market as children's cough medicine. And cocaine was recommended by doctors as anesthesia and as the means increasing endurance.