1. Many prehistorians believe[主句] that farming may have emerged independently in severalx different areas of the world[宾语从句] when small communities, driven by increasing population and a decline in available food resources, began to plant seeds in the ground in an effort to guarantee their survival.[时间状语从句]

2. The increase in food production in these regions led to a significant growth in population,[主句] while efforts to control the flow of water to maximize the irrigation of cultivated areas and to protect the local inhabitants from hostile forces outside the community provoked the first steps toward cooperative activities on a large scale.[时间状语从句]

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