Answer: The emergence of cities.
Explanation:
The growth of trade activities during the Middle Ages in Europe resulted in the emergence of the city's medieval model. In this context, it is possible to talk about population growth so that trade, cities, and population growth are closely linked. Over time, the trade will be one of the factors that will encourage people to make new geographical discoveries.
Answer:
It describes the principle of federalism.
What I can understand from your question, rational use suggest that you use things in a rational way or in a logical,astute,prudent way. This means, for example, you are lost in an island and you know someone is going to look for you in the following 10 days, still you dont know in which day you are going to be rescued. Because you are an inteligent human being you will decide to use your things in a rational way as if you dont do it you will have a shortage of supplies and most probably you are going to die.
-Hope this works...
