Even a virus’ envelops - the coating that many viruses have to protect their contents comes from the cells of its hosts. Which word from the article helps explain what “host” means

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

The amount of potential energy possessed by an elevated object is equal to what?

What is the single most important equation in all of physics?