Someone pls help with physic test plss

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell

Difference between series and parallel circuits

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?