1. the earth's carbon cycle consists of the flow, cycling, and recycling of all of the carbon on the earth. every living organism's composition includes the element carbon. how does carbon become part of living organisms?

your answer is "the 1950's"

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.