this depends on what country you are referring to.
i'm assuming you're referring to the united states, the executive is selected and appointed by recommendation of the president, then put forward to the houses of congress for ratification of appointment.
the president (the head of the executive) is, of course, elected by the public.
The president heads the executive branch.
the heads of major departments in the executive branch
the president
These 15 department heads of the executive department make up the president's cabinet.
The executive branch
The office of the president of the United States heads the executive branch.
The president heads the executive branch.
by he government
the heads of major departments in the executive branch
In most states how are the heads of most executive agencies chosen?
the heads of major departments in the executive branch
the president
In the US, the President heads the Executive Branch.
Yes
the president
The Governor.
These 15 department heads of the executive department make up the president's cabinet.