based on natural evolutionary relationships Answer Phylogenetics is the study of the closeness/relatedness of genetic codes.

There are several online sites where one can research more information on phylogenetics. Some of these online sites are "Wikipedia", "Researchgate", and "Bioinformatics".

means with the genetic codes we can classifiy the organisims

The word is phylogenetics or phylogeny.

The school of systematics that takes evolutionary theory into account is called phylogenetics. Phylogenetics uses evolutionary relationships to classify organisms into related groups, based on their shared common ancestry. This approach helps to understand the evolutionary history and relationships among different species.