I saw the linguistics connection as being that distinguishing one genus/species from another is a very similar problem to distinguishing one language/dialect fr

I saw the linguistics connection as being that distinguishing one genus/species from another is a very similar problem to distinguishing one language/dialect from another. In both cases the population of organisms or of language users doesn't break apart into disjoint subsets naturally---nobody has a label within them saying "homo sapiens" or "Farsi speaker". These distinctions are artificially imposed and ultimately arbitrary.