Science, who ever answers this will get a brainlest

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

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