If surface water is polluted, how does that affect the marine environment?

Explanation:

These pollutants have different environmental effects. Excess nutrients, for instance, may result in harmful algal blooms and hypoxia both in rivers and in coastal seas. Pathogens in rivers pose a threat to human health. ... Surface waters often suffer from the combined impact of multiple pollutants.

Explanation:

Surface water pollution is often caused by nutrients, pathogens, plastics and chemicals such as antibiotics, heavy metals and pesticides. These pollutants have different environmental effects. Excess nutrients, for instance, may result in harmful algal blooms and hypoxia both in rivers and in coastal seas. Pathogens in rivers pose a threat to human health. Chemical pollution can have toxic effects. Surface waters often suffer from the combined impact of multiple pollutants.

The answer to this question is B) a period of macroeconomic expansion followed by a period of macroeconomic contraction.