The main causes of the first world war were:
<h3>Militarism</h3>
There was a growth of millenarianism in nations. many nations had sophisticate weapons and well trained military.
<h3>Alliances</h3>
The alliances that were formed between nations was part of the war. There were the axis and the allied powers.
<h3>Nationalism</h3>
The increase in nationalism and the need to protect country and property was a part of the war.
<h3>Imperialism</h3>
Some nations has powers over other countries. They controlled the affairs and the resources in these areas.
<h3>Death </h3>
The killing of Franz Ferdinand was partly the reason why the war started.
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Answer:
It appears that you are talking about the Middle Ages so the answer is 'C'. Irrigation goes back to pre-history and the fertile crescent.
Explanation:
Yes, studying how mayfly population affects the number of trout in a stream is ecology.
Ecology seeks to unveil how different organism relate with one another as well as their environment.
Ecology is basically the study of distribution,abundance and relation of organisms and their interaction with their environment.
It would be "(D) British trade and defensive treaties with Texas," that was not a cause of delaying the annexation of <span>Texas, since the delay mostly had to do with the North being upset with the idea of adding another slave state to the Union. </span>
