Well, when you need to be able to draft your citizens into military service, there's a bigger push to teach kids how to be healthy and fit. When you instead have an all volunteer force and big lobbyist shoving money at the government to get people to buy more cereals and dairy you wind up with the food pyramid posters in every classroom.

The question posed has been answered well already, so this is a pedantic post purely to satisfy myself: the term descendant is incorrect or the sentence improperly structured. You should have asked either, "Are humans descendants or relatives of Neanderthals and Denisovans?" or "Are Neanderthals and Denisovans progenitors or relatives of humans?".