A planning commission shall: make and approve a plan; and recommend the plan to the legislative body for adoption. A planning commission may recommend adoption of: the whole plan; successive parts of the plan, which correspond to geographic sections or divisions of the local jurisdiction; and an amendment to the plan. The elements of the plan may be expressed in words, graphics, or any other appropriate form. The elements of the plan shall be interrelated and each element shall describe how it relates to each of the other elements.