22,000 were killed or injured. It was a result of "carelessness" on the part of the workers (as said in coursehero.com)
Answer: Every Confederate state signed a "Article of Secession" announcing their separation from the Union. Four states took it a step farther. Texas, Mississippi, Georgia, and South Carolina all filed further declarations, known as "Declarations of Causes," explaining their desire to secede from the Union.
Explanation:
knowledge!
The best way to measure public opinion is through opinion polls - B
With opinion polls you get an idea what is the general idea about a certain topic from the public, as you usually get a high enough sample to deduce the relevant information.
To answer your second question I would say it is either B or C as being a sole proprietor usually makes you subjec to being a small business or you're forced to use factors of production less efficiently.
The effects of Zhou metal workers mastering iron were…
Option A: during the Zhou dynasty, China was characterized by warfare, political and military reforms, but it was first unified during the Qin dynasty.
Option B: it is true that with the introduction of iron, China acquired stronger and more effective farm tools as well as increasing crop yield.
Option C: during the Zhou dynasty China not only developed iron technology but also improved technology of war making better weapons by means of smelted iron. As a result, iron weapons spread to the masses, contributing to the Warring States period.
Option D: it is also true that the Zhou jealously guarded the secret of smelting the iron and created a trading empire. The iron production encouraged trade and improved the empire economy.
Option E: Zhou craftsman are known for their iron art and it is still sold today. During the Zhou period, the craftsmanship had great importance for his skills for producing sophisticated iron weaponry.
Option F: Iron helped the Zhou rulers so much that they reserved the Mandate of Heaven for themselves alone. It was a period of cultural and intellectual expansion during Zhou era and the iron helped rulers keep the control of the land
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