living things regard natural relationships study variation evolution taxa whole set terms including taxonomy systematic biology systematics biosystematics scientific classification biological classification phylogenetics times overlapping meanings sometimes sometimes slightly different always related intersecting ref name wilkins ref name small ref broadest meaning taxonomy used term introduced de candolle ''th orie l mentaire de la botanique'' monograph taxonomic revision '''taxonomic revision''' '''taxonomic review''' novel analysis variation
Applied science Library and museum studies Classification Taxonomic classification