Dark energy is a term used to describe a. the driving force behind the big bang. b. the origin of new matter in the steady-state theory. c. electromagnetic energy outside the visible spectrum. d. what is causing the increasing rate of expansion of the universe.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.