The Oxygen Produced by Photosynthesis Is Considered an Ecosystem Service

question 70

Multiple Choice

The oxygen produced by photosynthesis is considered an ecosystem service because

• A) it is a beneficial, but not required, service provided by nature.
• B) it can only be produced by photosynthesis.
• C) environmentalists consider it important.
• D) it benefits humans and would be difficult or costly to replace.
• E) it cannot be altered and will always be available from nature.

---

Definitions:

Labor Demand

The total number of hours that employers are willing and able to hire at a given wage rate, reflecting the need for workers in the production process.

Labor Demand Curve

A graph showing the relationship between the quantity of labor demanded by employers and the wage rate.

Quantity of Labor

The total number of labor hours employed in the production of goods and services over a specific period.