Which of the following was a major difference between the first civilizations and the civilizations of the classical era.
a. the distance and importance of trade connections
b. the presence of powerful militaries
c. the existence of job specialization and social stratification
d. the improvement of agricultural technologies

Option: A. The distance and importance of trade connections

Explanation:

The first civilizations emerged on the banks of rivers, which made them easy for survival. Rivers provided drinking water, helped in irrigation, and transportation. The early civilizations recognized as the water monopoly empire. They regulated power and control access to water.

The civilization of the classical era developed around the Mediterranean Sea. This era emerged in their beliefs, social structures, lifestyles, and political institutions. Trade connections were important in the classical era. Goods were traded along with technologies and techniques in farming and domesticating.  Also, art and culture were exchanged from one civilization to another. Trade became one of the ways the classical era civilizations flourished.

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.