After reading the paragraph below, answer the questions that follow.
The largest estuary in the United States is the Chesapeake Bay, which extends through six states. The Bay is one of the most productive natural areas in the world. It is home to thousands of plants and animals, including many commercially important species. The water of the Bay is relatively shallow. Many areas are no more than 10 feet deep, with an average depth of 30 feet. Light penetrates the shallow water and supports submerged plants that provide food and shelter for the many species living in the bay ecosystem. However, like many estuaries, the Bay receives large amounts of fertilizer runoff from farms, lawns, and wastewater treatment facilities.
Fertilizer runoff contains ________, which are the most important limiting factors for phytoplankton growth.
◦ nitrogen and phosphorus
◦ oxygen and carbon dioxide
◦ sulfur and magnesium
◦ carbon and hydrogen
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