Final answer:
Using organic fertilizers is the human activity most likely to contribute to nutrient pollution in North Carolina's river basins.
Step-by-step explanation:
The human activity most likely to contribute to nutrient pollution in North Carolina's river basins is using organic fertilizers.
Organic fertilizers contain nutrients such as nitrogen and phosphorus that can easily runoff into nearby bodies of water when it rains. This runoff can then lead to an excess amount of nutrients in the water, causing eutrophication and harmful algal blooms.
For example, when farmers apply organic fertilizers to their fields, rainwater can wash away these fertilizers and carry them into rivers or streams, ultimately leading to nutrient pollution.
Learn more about Nutrient pollution in North Carolina's river basins