Answer:
It happens because the consuming is higher than the water drop rate, or even because there are too many people in a zone where there is not enough fresh water.
Question: What is significant about the Han ethnic group in China?
Answer: About nine out of every ten Chinese people belong to this ethnic group.
Explanation: Han ethnic group comprises 92% of the Chinese population, and 19% of the world's people so the ethnic group is the dominant group
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(jacemorris04)