What two kingdoms existed until 1937

Between 1866 and 1937 there existed only two kingdoms plant and animal kingdom. After that between 1937 to 1977 four new kingdoms were added  Protista (protists), Fungi, Monera (eubacteria), and Archaea (archaebacteria).

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succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: