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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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6 dic 520 año aC - признак начала Палеозойской эры. В многочисленных мелководных морях процветали морская флора и фауна. Особенно широко были распространены трилобиты.
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Водопьянова Олеся ЭБ17-02Б
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Олеся Водопьянова
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6 dic 520 año aC
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