Physical weathering is most active where temperature and rainfall are both. low. Chemical weathering is most active in regions of high temperature and rainfall. Most world. regions experience a combination of both physical and chemical weathering.
Answer: Pastoral nomads
Explanation: Pastoral nomads are producers of food, and the size of their tribal or ethnic units increases accordingly. These groups raise livestock, and they move about within their established territory to find good pastures for their animals.
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Droughts is your answer because flooded their dam by destroying it and put malaria in the water which flooded.