(1) The board of adjustment shall consist of not less than five or more than seven members to be appointed for a term to be specified by the city or town council or other legislative body or, if no term is specified, then for a term of 3 years. A member is removable for cause by the appointing authority upon written charges and after public hearing.
(2) Vacancies shall be filled for the unexpired term of any member whose term becomes vacant.