In Which Situation Are Humans Not Directly Affecting the NPP

question 172

Multiple Choice

In which situation are humans not directly affecting the NPP of aquatic ecosystems by altering nutrient concentrations? That is, which situation is natural, rather than caused by humans?

• A) Rising CO₂ from global warming increases NPP of ocean phytoplankton.
• B) Phytoplankton blooms occur when iron sulfite is added to ocean water.
• C) Artificial fertilizers from land cause plankton blooms in the Gulf of Mexico.
• D) Sewage and wastewater cause eutrophication in Lake Erie.
• E) High nitrogen levels in the Pacific Ocean keep NPP high.

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