- Mongols made largest empire of the time. - made closer connections across Eurasia. - Increased the rate of technology and crop exchange, mixing of all people, spread of epidemic disease. - Mongol resistence of other religions got easier to spread of religion.
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Looking at the given chart, we could see that Paleozoic era follows the Precambrian time. So, <u>Option C is the correct answer.</u>
More details:
Option A states that, ‘Scientists study fossils from the Jurassic period’. After analyzing the chart, we can say that this does not help to research about Paleozoic era since Jurassic period is in Mesozoic Era.
Option B states that, ‘Scientists observe index fossil records of the Mesozoic era’. Again, this does not help to research the start of Paleozoic era.
Option C states that, ‘Scientists examine fossil evidence during the Precambrian time’. Yes. Correct. Researching about things at the Precambrian time might help them to identify what would have happened before Paleozoic era.
Option D states that, ‘Scientists explore the emergence of mammals and humans in the Cenozoic era’. This does not help since this era just 1.6 million years ago. But Paleozoic is about 500 million years ago.
Due to the growth of service industry in the late 1800s, the middle class in the United States grew as people took jobs as clerks, lawyers, and teachers.
<u>Explanation:</u>
In the late 1800s, America was perceived as the land of economic opportunity. Many people immigrated to America seeking job opportunity.
The service industry in the United States grew in the late 1800s. Petroleum refining, steel manufacturing and electrical power industry emerged after the Civil War. This led to great I<u>ndustrial Revolution</u>. Growth in industry causes industrialists wealthy and middle class prosperous.
The middle class people improved their status by working as clerks, lawyers, and teachers.
Answer:
Explanation:
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