Biological systematics classifies species by using three specific branches. Numerical systematics, or biometry, uses biological statistics to identify and classify animals. Biochemical systematics classifies and identifies animals based on the analysis of the material that makes up the living part of a cell—such as the nucleus, organelles, and cytoplasm. Experimental systematics identifies and classifies animals based on the evolutionary units that comprise a species, as well as their importance in evolution itself. Factors such as mutations, genetic divergence, and hybridization all are considered evolutionary units.
BioloGICal SystemAticS CLASSIfIeS specIes By UsiNG thrEe SpECIfIC BRAnChES. nuMerIcaL systEMAtics, or bioMetrY, uSes bioloGicaL STatiStics to ideNTify And clASsify AnIMaLs. BIoChemical sYStEmAtIcs clAssifiEs and iDentifIeS anImaLs BaSeD oN The anaLysIS of the MatErial That mAkes uP tHE liVINg part of a cELL—Such aS The NUcLeuS, OrgANelleS, And cytOPLASm. ExperimentAL systematics idEnTiFies anD classifIes aNiMAlS Based oN THe eVoluTioNaRy Units ThaT compRisE A species, AS weLl aS their iMpORtaNcE In eVoLutIoN ItsElf. faCtors such as MUtaTIOns, genetIc dIVergencE, aNd hybridIZAtION all Are cOnSideReD eVolutionary units.