The forces can be distinguished as follows:
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Nutrient pollution: This refers to the contamination of water bodies with excessive nutrients, which can lead to issues like algal blooms and impacts on aquatic life. It is more related to environmental issues rather than human movement.
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Globalization: This is the process by which businesses or other organizations develop international influence or start operating on an international scale. It fosters connections between different regions and can significantly influence migration patterns.
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Runoff: This is the flow of water (usually from rain) that moves across the land surface and can carry pollutants into water bodies. Like nutrient pollution, it is more related to environmental processes than to human movement.
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Migration: This is the movement of people from one place to another, often for reasons such as work, family, or seeking a better quality of life. It directly involves people changing their residence locations.
The force most likely to connect two different regions where people are changing residence locations is migration.