real basic units of classification

the lowest units of classification

artificial concept of human mind which cannot be defined in absolute terms

real units of classification devised by taxonomists.

the classification of organisms based on broad morphological characters

delmiting various raxa of organisms and establishing their relationships

the classification of organisms based on their evolutionary history and establishing their phylogeny on the totally of various parameters from all fields of studies

identification and arrangement of organisms on the basis of their cytological characteristics.

Species

Division

Class

Family