At least 7 billion people
        
                    
             
        
        
        
Answer:
The Von Thunen model of agricultural land use was created by farmer and amateur economist J.H. ... Farmers in the Isolated State transport their own goods to market via oxcart, across land, directly to the central city. Therefore, there are no roads. Farmers act to maximize profits.
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20 meters walk south is the <u>short leg</u>. The long leg is 30 meters walk east.  Distance from 30 meters east to starting point is a hypotenuse. 
 
        
             
        
        
        
Answer: The period known as classical antiquity began with the emergence of the city-states of ancient Greece. Later, the Roman Empire came to dominate the entire Mediterranean basin. The fall of the Roman Empire in AD 476 traditionally marks the start of the Middle Ages.
Explanation:
 
        
             
        
        
        
A large volume of air that has nearly the same temperature and humidity at different locations at the same altitude is called the Air Mass. Air mass covers hundreds or thousands of square miles and adapt to the characteristics of the surface below them at the same time they are also classified according to latitude and their continental or maritime source regions.