Each board, commission and committee established prior to the adoption of this Charter shall continue to exist, exercise the powers and perform the duties assigned to it upon adoption of this Charter. However, the Council may alter the structure, membership, powers and duties of boards, commissions and committees. The Council also may abolish or create particular boards, commissions and committees, provided that the Council may not abolish the Commissions or Boards specifically provided for in this Charter. The Council may grant powers and duties to boards, commissions and committees that are consistent with the provisions of this Charter.