Answer:
The ozone layer absorbs a large portion of incoming UV radiation.
Explanation:
This means it keeps ground-level ozone from forming. A higher percentage of UV radiation entering the troposphere would allow a greater amount of ozone to form in the troposphere.
B. The rivers were used to sustain life by growing crops and food and having an unlimited drinking supply.
Explanation:
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I believe that would be Mesopotamia, the seat of the Sumerian and Akkadian civilizations.
Source: Studied this last week. :)
