One modern-day social structure that had its origin in the neolithic era is
a. trade of goods and services
b. democratic government
c. equality between men and women
d. public education

One modern-day social structure that had its origin in the Neolithic era is "a. trade of goods and services," since it was during the Neolithic Period that people began to domesticate plants and animals--thus having a surplus of food with which to trade.