What can archeologists learn by studying packrat nests?

Concentration and Temperature.

Explanation:

Scientists are greatly concerned about the effects that rising carbon dioxide concentration and temperature will have on organisms in the future.

Packrats save things they find near their homes. These things include bits of leaves, seeds, or small man made items. Packrat nests have become little time capsules and show us what the environment was like at the time the packrat lived. In the dry Southwest these can last for many thousands of years so, by examining the nests, we can see environmental change over time.

Explanation:

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the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof

hutus would be your answer.

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