sentences:  For the advocates of phylogenetic nomenclature, a taxon is an individual, an entity that gains and loses attributes as time passes.Just as a person does not become somebody else when his or her properties change through maturation, senility, or more radical changes like amnesia, the loss of a limb, or a change in sex, so a taxon remains the same entity whatever characteristics are gained or lost.For any individual, there has to be something that connects its temporal stages in virtue of which it remains the same thing.