It is true that the agencies functions seperately because because putting them in a department would pose a symbolic or practical problems.
These are agencies created to oversee specific areas of the government's responsibility to its citizens.
The federal agencies are divided into the independent agencies and cabinet-level agencies.
Furthermore, the independent agencies remain independent rather from cabinet-level department because putting them in a department would make their missions subordinate to the department's primary mission.
Therefore, the statement is a true statement.
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