These days, with DNA testing.
Earlier, by looking for detailed similarities.
cladistics
There are many methods to determine how closely related two species may be. You could begin by comparing embryo morphology, doing radioactive dating or a visual inspection of structural and genetic similarities.
Scientists look at genetic similarity and morphological features to determine if species are related. Genetic similarity involves comparing DNA sequences to see how closely related two species are, while morphological features involve comparing physical characteristics like bone structure, body shape, and patterns.
To identify organisms and determine how groups are related.
Scientists examine the bones of the species or the species body parts or the entire body. p.s good luck with the question if this didn't help ....... lol good luck duck
Characteristics used to classify a species include physical traits, genetic differences, behavior, habitat, and evolutionary history. Scientists often use a combination of these characteristics to determine how species are related and place them into taxonomic groups.
Through the study of DNA gene sequences they can determine which sections of the DNA have been inherited from a common ancestral species.
They are related to all other species of ant.
you can't
Molecular evidence helps determine the genetic similarities and differences between species by comparing their DNA sequences. The more similar the DNA sequences are between two species, the more closely related they are believed to be. This information can be used to construct phylogenetic trees and identify evolutionary relationships among different species.
Phylogenetics, comparative genomics, and protein sequence analysis are used to study distantly related species by identifying similarities and differences in genetic material or protein sequences to determine evolutionary relationships. These approaches help trace common ancestry and understand the genetic mechanisms governing species divergence over time.
A group of closely related species would share the same genus.