Refer to the figure showing a region in the human lung. 
Surfactant can be found along the surface labeled _______, which is in an alveolus of the lung and serves to decrease the work necessary to inflate the lungs.
Definitions:
Normative Economic Statement
An opinion or value judgment about what ought to be, rather than what is measurable or empirically observable.
Legal Minimum Wage
The lowest hourly, daily, or monthly remuneration that employers are legally allowed to pay their workers.
Unemployment
The situation when individuals who are capable of working and are actively seeking work are unable to find employment.
Equality
A state of being equal, especially in status, rights, and opportunities.
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