Answer:
3. biological hazard
Explanation:
Any hazard that can be carried around the world and spread through contact can be spread quickly, specially owing to the mobility of humans. Noninfectious diseases cannot be transferred via human mobility as it is noninfectious. Chemical hazard require the chemical to be physically transported without the need for human itself. Physical hazard, as well, require the hazard to be transported or travel on its own without the influence or interference of humans. Biological hazard can be transmitted via human body as they become the carrier of the hazard.
Answer:
Farm life. They had a difficult time in the 1800s and 1900's. They had to use wireless (I'm sure it is, I forgot) fences to hold cattle. They had to make better shelter on storms and take care of their animals. This was a challenge to them.
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It is when whatever you are doing lasts half the time that it would normally take.
Answer:
The Qing Dynasty
Explanation:
The Qing Dynasty was the last imperial dynasty to rule China.
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the gulf costal plains because it would be easy to get water for the crops