Question

rainfall runoff from farmland... may raise the biological oxygen demand of local water systems. is considered a non - point source of water pollution. helps to fertilize local water systems, improving the ecosystem. carries plant nutrients into the local water systems.

Explanation:

Rainfall runoff from farmland can carry organic matter increasing BOD, is a non - point source as it's diffuse, and transports nutrients. It usually degrades water quality rather than fertilizing to improve ecosystem in a positive way.

Answer:

1. A. May raise the Biological Oxygen Demand of local water systems.
2. B. Is considered a non - point source of water pollution.
3. D. Carries plant nutrients into the local water systems.