More food= more people, more people means you need more food, which means you get people to make more food, which attracts more people, etc, etc.
1 and 4 are
pull factors of migration .
The Morrill Land-Grant Acts are United States statutes that allowed for the creation of land-grant colleges in U.S. states using the proceeds of federal land sales.
<span>Aristarchus was an astronomer who taught that the sun was the center of the universe.
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so B.the center of the universe. is the answer
