<em><u>Answer</u></em><em><u> </u></em><em><u>:</u></em><em><u> </u></em>
<u><em>There</em><em> are three ways in which humans and environment interact with each other</em><em> </em><em> </em><em>:</em></u><em> </em>
- <em>Humans</em><em> Depend on the Environment:</em><em> </em><em>The natural environment is made up of living things and non living things. Humans depend on the natural environment for their basic needs; food, shelter, and clothing.</em>
- <em>Humans Modify the Environment: </em><em>People modify (change) the natural environment to meet their needs. For example, they build dams, plow and irrigate fields, and dig mines. They build houses, schools, and shopping centers on land. This also includes human's impact on the earth's health. Creating pollution, litter and carbon dioxide all affect the earth's condition. </em>
- <em>Humans Adapt to the Environment:</em><em> </em><em> </em><em>Humans</em><em> have settled in virtually every corner of the world by successfully adapting to various natural settings. </em>
- <em> have settled in virtually every corner of the world by successfully adapting to various natural settings. For example, people who live in the northern United States use heating units to keep their homes warm in winter. People in the southern part of the United States use air conditioning most of the year to stay cool in the heat. In addition, in countries where earthquakes are common homes and buildings are built to survive an earthquake. </em>
<em><u>Hope</u></em><em><u> </u></em><em><u>this</u></em><em><u> </u></em><em><u>helps</u></em><em><u> </u></em><em><u>u</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em>
<em><u>If</u></em><em><u> </u></em><em><u>i</u></em><em><u> </u></em><em><u>helped</u></em><em><u> </u></em><em><u>u</u></em><em><u> </u></em>
<em><u>Mark</u></em><em><u> </u></em><em><u>me</u></em><em><u> </u></em><em><u>as</u></em><em><u> </u></em><em><u>brai</u></em><em><u>nlist</u></em><em><u>.</u></em><em><u>.</u></em>
The correct answer is D. Decreased travel times.
The industrial revolution revolutionized the transport as well, so in this period we have the emergence of transporting machines, like the trains for example, and they were also getting better and better as the year passed by, and they were of great help to the people, especially when they had to travel on long distances.
The main reason for the wall's construction had always been defense. Since China's first dynasty, the empire faced a near-constant threat of attack from the nomadic tribes to the north. This included those famed Mongols as well as lesser-known groups like the Xiongnu and the Göktürks.
I think the answer is D:all of the above.
