In the past, Aristo title say humans are social animals. Social animals, in this case, it is assembled as a group. Mainly mammals and insect Zoo, for example, dogs, monkeys, sambar deer, bees, termites, etc.
.Make me think that humans will survive, it must rely on live. The first reason is.
Also that humans must help each other, because all men are not able to do everything manually. Need help
And the reason the last deals, because it is a matter of humanity, themselves.