9. what did the social class with the largest number of people contribute to early civilizations

Answer : The social class mainly belonged to peasant class or the working class and they contributed crops and other things.

Explanation : In early civilizations, the peasant class or working class were the largest social class by majority number of people. These people majorly worked in agriculture and grew the food and crops needed to sustain and feed the society. So, these were the only contributions they gave to early civilizations.