a. After the appointment of a planning board, the mayor may appoint one or more persons as a citizens' advisory committee to assist or collaborate with the planning board in its duties, but such person or persons shall have no power to vote or take other action required of the board. Such person or persons shall serve at the pleasure of the mayor.
b. Whenever the environmental commission has prepared and submitted to the planning board and the board of adjustment an index of the natural resources of the municipality, the planning board or the board of adjustment shall make available to the environmental commission an informational copy of every application for development submitted to either board. Failure of the planning board or board of adjustment to make such informational copy available to the environmental commission shall not invalidate any hearing or proceeding.