The Addition of Excess Phosphorus Causes Lakes to Become Eutrophic

question 29

Multiple Choice

The addition of excess phosphorus causes lakes to become eutrophic because the nutrients trigger blooms of photosynthetic cyanobacteria. Why do these blooms cause low oxygen levels in lakes?

• A) Cyanobacteria use up more oxygen than they produce.
• B) Excess phosphorus binds to dissolved oxygen in the water.
• C) Cyanobacteria are net producers of oxygen while alive, but when they die aerobic bacteria use oxygen while decomposing them.
• D) Cyanobacterial blooms only occur in waters naturally low in oxygen.
• E) Cyanobacteria are aerobic heterotrophs, consuming oxygen and producing carbon dioxide.

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Definitions:

Common Fixed Expenses

Costs that do not vary with the level of production or sales and are shared among different segments or products of a company.

Break-even

The point at which total costs and total revenues are equal, resulting in no net loss or gain.

Sales Dollars

The total revenue generated from the sale of goods or services, measured in dollar amount.

Common Fixed Expenses

Expenses that remain constant in total regardless of changes in the level of activity or volume of output.