Answer:
Democracy.
Explanation:
In the period of Ancient Greece there were many city-states established, that had different forms of government. The most peculiar one was created in Athens, known to us as democracy. With many reforms introduced by Cleisthenes, Solon and others, Athenians created a system inside which the people had authority and possibility to govern themselves through certain institutions such as Ecclesia. Of course, Athenian democracy differed from modern democracy as a lot of people didn't had the right to participate in public life.
Think of it as a giant chain. You have the President at the top, then followed by the vice president, and so on to the bottom of the chain. if the first link of the chain is broken, then you replace it with the chain link below it. So, the Vice president would replace the President, the Speaker of the House of Representatives would replace the Vice President, and so on.
<span>It followed common sea routes.</span>
The answer is letter c, specialization increase the demand for product. It is because specialization focuses more on the products that are being produced in which they provide greater quality for the consumers in which promotes its product efficiency.