Biosystematics aims at: a) the classification of organisms based on road morphological characters
b) identification and arrangements of organisms on the basis of their cytological characteristics
c) delimiting various taxa of organisms and establishing their relationships
d) the classification of organisms based on their evolutionary history and establishing their phylogeny on the totality of various parameters from all fields of studies

c) delimiting various taxa of organisms and establishing their relationships

Explanation:

Biosystematics is the study of biological diversity and its origins. It focuses on understanding evolutionary relationships among organisms, species, higher taxa or other biological entities, such as genes and the evolution of the properties of taxa including intrinsic traits, ecological interactions, and geographic distributions.

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in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".