Explain why chances of nose bleeding increase with altitude in humans

High altitude – as altitude increases, the availability of oxygen decreases, making the air thinner and drier. The dryness can cause the nose to bleed.

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.