7-3-401. Commission form. The commission form consists of an elected commission (which may also be called the council) and other elected officers as provided in this part. All legislative, executive, and administrative powers and duties of the local government not specifically reserved by law or ordinance to other elected officers shall reside in the commission. The commission shall appoint the heads of departments and other employees, except for those appointed by other elected officials. Cities and towns which adopt this form may distribute by ordinance the executive and administrative powers and duties into departments headed by individual commissioners.