These days, with DNA testing.
Earlier, by looking for detailed similarities.
DNA hybridisation is where DNA is compared from different species to determine how closely species are related
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.
physical similarties in body structures
The biological system of classification relates to the diversity of species because the system of classification is how we organize the diversity of species. With out it we would have a hard time trying to determine which animals belong with which group. There would be no order, just chaos of trying to determine animal likeness of one another.
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
how can you expermentally determine if a organism is a keystone or a foundation species
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
A group of closely related species would share the same genus.