Which labeled structure shown in the diagram is a remnant of fetal circulation that is not directly involved in adult circulation? 
Definitions:
Principal-Agent Problem
A conflict in priorities between a person or group (the agent) acting on behalf of another person or group (the principal).
Job Performance
The level of effectiveness and efficiency with which an individual completes their work tasks and responsibilities.
Correct Actions
Appropriate or effective measures taken to achieve a desired outcome or resolve a specific situation.
Monopsony
A market situation where there is only one buyer for a product or service.
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