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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Definitions:

Preferred Stock

A type of stock that gives its holders preference over common stockholders in terms of dividends and claims on assets during liquidation.

Treasury Stock

Treasury stock is made up of shares that have been issued and subsequently bought back by the company that issued them, which decreases the number of shares available on the open market.

Common Stock

A type of equity security that represents ownership in a corporation, providing voting rights and a share in the company's profits through dividends.

Par Preferred Stock

Preferred shares issued at a stated value (par value), which typically determines the dividend payments and is considered during liquidation.