Harsh Treaty of Versailles, massive war debt, and a weak League of Nations
The Treaty of Versailles was very harsh toward the losing side in particular Germany. The harshness of the treaty caused nationalistic reactions leading to military buildup and extreme leaders to take control. 
Massive debt in Europe led to depression in Europe and eventually in the US. The depression made economies stop dead in their tracks and caused hyperinflation in Germany as well as weak currency. These conditions also contributed extreme leaders. 
Lastly, the construction of the League of Nations provided weak leadership when countries became aggressive. The US refused to join despite being the architect of the organization. In addition, the countries turned to appeasement instead of addressing the aggressors. 
 
        
             
        
        
        
Answer:
B. Tested arrivals about their health and whether they were fit to work.
Explanation:
Ellis Island is an island in New York Harbor that plays a major role in inspecting and acting as the major point of transition or threshold for the immigrants entering America. It was also a processing point for the millions of immigrants from 1892 to 1954.
One of the important roles that this federally-owned island is its role in processing and inspecting the incoming immigrants into the American nation. It was here that any incoming immigrants were tested about their health, and processed according to their ability to be released to enter America or be held further in the island until they are fit.
Thus, the correct answer is option B.
 
        
             
        
        
        
It is a value of a continuous quantity that can represent a distance along a line. The real numbers include all the rational numbers, such as the integer -5 and the fraction 4/3, and all the irrational numbers such as the square root of two.
        
             
        
        
        
Answer:
C.) Clean technology.
Explanation:
Nothing but energy from the sun or other forms of energy are being used.
There also is no destruction of other natural resources in the process.