Once civilizations could grow excess food thousands of years ago, people in those societies soon learned to
a) make weapons to attack their rivals.
b) create religions with specific rules.
c) specialize in specific forms of labor.
d) build ships to begin exploring the world.

C)

Explanation:

Based on the information provided it can be said that people in those societies soon learned to specialize in specific forms of labor. This can be said because before there was excess food everyone in the society was a hunter or farmer and needed to find food. Once they had excess food the people needed other resources in which they started to specialize in specific forms of labor, in order to gather those resources.

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