Ancient civilizations were built along rivers because the land was fertile.
Answer: The gravity of the Sun
Explanation: The gravitational pull of the sun is strong enough to keep the planets rotating.
Europeans traveled the word to expand trade, religion, and land. The negatives were the destruction of the cultures and people affected by the colonization.
Answer: The correct answer is : zero ; the rate of technological progress
Explanation: In the Solow growth model with population growth and technological change, the steady-state growth rate of income per person depends on the rate of technological progress. According to the Solow model, persistently rising living standards can only be explained by technological progress.
