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Fascinating exploration of the marine life forms known as Ediacarans, the oldest known fossils yet discovered which date back some 600 million years. McMenamin, who has been carrying out research into these unique life forms for many years, concludes that although they are related to animals, Ediacarans were not animals in the strict sense, because they never passed through an embryonic stage that is peculiar to all known life forms. However, they seemed to have developed a central nervous system and brain independently from animal evolution. This finding has profound implications for our understanding of evolution.