Answer:Geographic featured that acted as norther borders of the Roman Empire at its height were: Rhine River, Danube River, Carpathian Mountains, and the Black Sea.
<u>Answer:</u>
<em>A country’s gross domestic product is the total amount of </em><u>goods and services</u><em> produced in a given year.</em>
<u>Explanation:</u>
Gross domestic product or the GDP is defined as the total number of monetary or market value in which all the goods which are well produced and the features which is delivered inside the country within a specified time.
<em>This method is used all over the world to measure the GDP of their respective region or area.</em>
