Answer:
What does it means,MATERIAL GWORL
The launching of D. Sputnik started the space race
Answer:
Available online are approximately 1,900 posters created between 1914 and 1920. Most relate directly to the war, but some German posters date from the post-war period and illustrate events such as the rise of Bolshevism and Communism, the 1919 General Assembly election and various plebiscites.
Explanation:
Howard Chandler Christy (1873-1952) put the Christy girl into wartime service for the Marines and the Navy, as did other poster creators. James Montgomery Flagg (1870-1960) designed what has become probably the best-known war recruiting poster: "I Want You for U.S. Army
Answer:
B, their number system.
Explanation:
The Arabic Number system (1,2,3,4,5,6- Numbers like these.) was created in India and later adopted by Arabs. The reason they call it Arabic, is because the Europeans were introduced to it from Arabs and not Indians, so they assumed Arabs made it.
Opportunity cost refers to what you have to give up to buy what you want in terms of other goods or services. When economists use the word “cost,” we usually mean opportunity cost.