The disease is highly variable in the way it may present, and also in its outcome among individuals and across different ancestral groups. (sciencedaily.com)
«There was a single ancestral group of organisms, and some split off to become fungi and some split off to become animals.» (discovermagazine.com)
«It doesn't mean that most Native American languages are related to each other, it just means that the populations that speak those languages descend from a single ancestral group,» says Reich. (newscientist.com)