In an experiment studying classical conditioning, a tone sounds and 5 seconds later a mild skin shock is delivered to a participant. the skin shock results in a stress response consisting of a temporary increase in heart rate. this process is repeated once every 5 minutes. after a number of trials, the participant demonstrates an elevated heart rate when the tone sounds and before the shock is ctually delivered. within the context of this example, what is th o the increase in heart rate to either the shock or the tone 0伍eoscillating increases and decreases in heartrate the increase in heart rate after the shock o the increase in heart rate after the tone but before the shock

                                                        water

a colorless, transparent, odorless, tasteless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.

                                                        halon  

any of a number of unreactive gaseous compounds of carbon with bromine and other halogens, used in fire extinguishers, but now known to damage the ozone layer.

                                                  dry chemical

extinguishing agent used on class a, class b, and class c fires.

                                                  carbon dioxide

a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. it is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.

answer: c more big rigs and commercial vehicles

explanation: because big rigs drive far to deliver products overnight