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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b.   jim crow laws were enacted in northern states.

the correct answer that would best complete the given statement above would be option b. expanding civil services. diocletian and constantine paved the way for foreign invasion by dividing the empire, creating administrative bureaucracies and reorganizing the military, except for expanding civil services. hope this answer .

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