Answer:
<h2>a, the use of trench warfare</h2>
Trench warfare in World War I meant that the armies dug into trenches to hold their ground. But it proved impossible for them to make any advances against each other. If they would try to mount an attack, venturing into "no man's land" between the trenches, they'd get mowed down by machine gun fire. In addition to bullets and artillery fire, trench warfare also came to involve the use of chemical weapons like mustard gas. Trench warfare in World War I was miserable and gruesome.
Answer:the loss of potential gain from other alternatives when one alternative is chosen.
"idle cash balances represent an opportunity cost in terms of lost interest"
Explanation:
Leonardo Da Vinci is the most important scientist from the renaissance. I really hope this helps
The "Golden twenties", as it was named, was an era of economic success that started after the end of WW1, and ended in 1929 with the Wall Street Crash.
In WW1, the USA were the main exporters of armament and other products to the european countries. That situation generated a lot of income for the country.
In addition, the United Kingdom, hit by the consequences of war, lost its position as the world's main power, which was taked by the USA. With this new status the United States begun to control the commerce, using its privileged position.
Whitin the USA, new technologies that increased the industrial production started to be developed, with the increase of job positions as a necessary consequence.
With all the situations described, the United States lived a period of prosperity both in the domestic sphere and in the commercial relationship with other countries.
