I think that i got the answer for number (30) and i think that the answer is (c) because it's George Washington and James Madison.
hope it help
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Scientists believe that Mashkan-shapir's collapse was caused in part by destruction of the fields by mineral salts. When mineral salts concentrate in the upper levels of the soil, it becomes poisonous for plants. In Mesopotamia, irrigation was essential for crop production.
B.
The Twenty-third Amendment (Amendment XXIII) to the United States Constitution extends the right to vote in the presidential election to citizens residing in the District of Columbia by granting the District electors in the Electoral College, as if it were a state.
Answer:
Correct answer is C. specialization.
Explanation:
Option A is not correct as education is a broad category, but it is not always connected with labor.
B is not correct as it is more of a way of thinking to preserve nature.
C is correct as surplus means that you have more product than you need, nothing else.
D is correct as specialization led to redistribution of labor. People were engaged in different things and thus provided their incomes.
