During the twentieth century, the study of the large-scale structure of the universe evolved from the theoretical to the practical; the field of physical cosmology was made possible because of both Einstein's theory of relativity and the better ability to observe extremely distant astronomical objects. Option A is correct.
Albert Einstein formulated two theories which he included to his theory of relativity. On the one hand the special relativity and on the other hand, general relativity.
The former refers to the lack of gravity and the physical phenomena that occurs because of it and the latest refers to the law of gravitation.
"Countries with a sphere of influence should maintain free access to their ports"
The most important outcome of the Atlanta campaign in 1864 was Union General Sherman facing off against the Confederate generals.
Answer:
B- The harsh conditions imposed by the Treaty of Versailles and an economic depression
Explanation:
The treaty of Versailles left many countries extremely poor, and wanting more land that they didn't get. Many times when there is a problem in a country, everyone blames a group of people even if they did nothing, which is what happened with the Nazis blaming Jewish people for the economic depression. Hard times made people be more proud of their country, which then turned into nationalism.
Sir your asking what is it then it's essential to the conduct of warfare
