If the question is asking you all except which, the answer is "people fled the urban centers because they had become too crowded and unsanitary"
Answer:
can the answer be more than one? id say both b and d.
Explanation:
by domesticating them, they were able to easily get milk and such from the animal without killing it yet or it foghting back. and also the example of domesticated dogs used to herd sheep. Maybe its just d if it can only be one but id say both b and d
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