Answer:
A) they enforce rules that control conduct within a population
Explanation:
Because without no government who is going to enforce rules on the states when things start going downhill with the states. And its common sense.
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Answer:Economists have had an enormous impact on trade policy, and they provide a strong rationale for free trade and for removal of trade barriers. Although the objective of a trade agreement is to liberalize trade, the actual provisions are heavily shaped by domestic and international political realities. The world has changed enormously from the time when David Ricardo proposed the law of comparative advantage, and in recent decades economists have modified their theories to account for trade in factors of production, such as capital and labor, the growth of supply chains that today dominate much of world trade, and the success of mercantilist countries in achieving rapid growth.
Explanation:
True, the Travis letter had an immense and immediate effect.
Cyclic movements differ from migration as cyclic movements are short trips and involve a return to home but migration is permanent.
<h3>What is migration?</h3>
Migration refers to the movement of people from one place to another intending to settle at a new location.
Cyclic movement differs from migration as cyclic movements are short trips and involve a return to the home base while the migration is permanent.
Therefore, D is the correct option.
Learn more about Migration here:
brainly.com/question/12719209
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Answer: b. Was an English anesthesiologist who used natural experiments
Explanation:
John Snow, in Snow on Cholera, Was an English anesthesiologist who used natural experiments.
