By about __________ b.c., most of the major characteristics of civilizations can be seen.

From the time agriculture developed to about 6000 b.c., people in the Near East lived in __________.

Nonhuman vocal systems are often referred to as __________ systems, because they do not combine different calls to produce new meanings.

The different forms of reciprocity are connected by the fact that they all __________.

Which of these is a common task for young children?

How many mutually unintelligible languages have been identified?

In egalitarian societies, people may differ in prestige, but these differences are not related to __________.

While there are many negative consequences to globalization, the United Nations has suggested an improvement in __________.

How do social scientists generally measure the degree of class mobility?

Many have suggested that the United States and other developed countries are now transitioning from __________ to __________.