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# One of the natural classification systems developed by George Bentham and Joseph Dalton Hooker for classification of flowering plants did not include:

( a ) external features and internal features
( b ) embryology
( c ) ultra- structure, anatomy
( d ) none of the above

As against this, natural classification systems developed, which were based on natural affinities among the organisms and consider, not only the external features, but also internal features, like ultra- structure, anatomy, embryology and phytochemistry. Such a classification for flowering plants was given by George Bentham and Joseph Dalton Hooker.