Phosphorus, Which Is Often a Limiting Nutrient in Ecosystems, Is

question 22

Multiple Choice

Phosphorus, which is often a limiting nutrient in ecosystems, is important because it

• A) evaporates quickly.
• B) is found only in sedimentary rocks.
• C) is necessary for the production of cellulose so that autotrophs can grow and provide food for heterotrophs.
• D) is part of the hydrologic cycle.
• E) is needed for molecules such as adenosine triphosphate (ATP), cell membranes, and nucleic acids.

---

Definitions:

Adam Smith

An 18th-century Scottish economist and philosopher known as the father of modern economics, famous for his work "The Wealth of Nations."

Modern Economics

A branch of social science that studies how individuals, businesses, and governments make choices on allocating resources to satisfy their needs and wants.

The Wealth of Nations

A seminal book by Adam Smith, which discusses economics, the importance of free markets, division of labor, and productivity.

Labor

The physical and mental effort used in the production of goods and services.