The image below depicts the three basic functions of a nephron. Identify the process that occurs in the section labeled 2. 
Definitions:
Unearned Revenue
The liability created by receiving revenue in advance.
Fees Earned
Income generated from providing services to clients or customers.
Dividends
A portion of a company's earnings distributed to shareholders as a return on their investment.
Miscellaneous Expense
Small, often irregular costs that do not fit well into other categories of a budget or financial statement.
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