How was the life of early men

hard work

Explanation:

In the Paleolithic period (roughly 2.5 million years ago to 10,000 B.C.), early humans lived in caves or simple huts or tepees and were hunters and gatherers. They used basic stone and bone tools, as well as crude stone axes, for hunting birds and wild animals.

Many years ago, early humans lived in the jungle and were afraid of bigger and stronger animals. They did not know how to build houses. So, they spent their time on the trees or hid themselves behind the bushes. But all this could not help them to save themselves from wild animals and harsh climatic conditions.

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.