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Episode: Versuch und Irrtum in der Natur

Paläobotaniker befassen sich mit der Pflanzenwelt vor Jahrmillionen. Geologie und Botanik stehen in solchen fernen Zeiten in engster Symbiose. Es zeigt sich, dass das Leben mehrfach radikale Kehrtwendungen vollzieht. Die Evolution des Chlorophylls, die Feindschaft gegenüber Sauerstoff und das Leben in einer Sauerstoffatmosphäre wechseln einander ab. Prof. Dr. Daber leitet eine der interessantesten Sammlungen der Welt an der Humboldt-Universität in Berlin.