A Bureau.
Education is a department in the Presidential Cabinet.
Yes, it is a Cabinet department
Yes, it is a Cabinet-level department.
That depends on the department. If the department is a Cabinet Level department (Defense, Interior, etc.) the head is a cabinet secretary, while other departments (Postal Service, Fish and Wildlife Department) are not Cabinet Level and therefore their heads are not cabinet secretaries.
The first Cabinet department formed in the 1900s was the Commerce Department.
No
The Department Of Homeland Security.
The Department of Commerce was formed in 1903 as the Department of Labor and Commerce. In 1913, the Department of Labor was made a separate cabinet department.
Department of Defense for cabinet and Postal Service for none cabinet
The Department of Agriculture became an executive cabinet in 1889.
The senate approves the head of the cabinet department.
One of the principal purposes of the Cabinet (drawn from Article II, Section 2 of the Constitution) is to advise the President on any subject he/she may require relating to the duties of their respective offices.