Primary and secondary succession

Primary succession occurs in an area where there was previously no life or soil, such as newly formed volcanic islands or regions left bare by retreating glaciers. It begins _________ __________ ________ _________ __________ _____ ________ ______ _____.
_________ _______ ___ ___ ____ __________.
__________ ____ ______ _______ __________ _______ ______.
__________ ____ ____ ____ ____.
_________ __________ _________ _________ ___ _________ ____ _______ _____.
______ _____ _______ ____ _________ ____ ______ _________ _____ _______ ____ __________.
_______ _______ ___ ________ __________ ______ ______ _____ ________.
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______ ____ ___ __________ ____ _________ _______ ______ __________.
_______ ___ ___ ______ __________ ______ __________ _______ ____ _____ _______.
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