What does the light reaction need to occur and what does it produce

well, you see. the answer to your question is quite simple. the thing that is big, powerful, and over 9,000 is your mom.

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.