What is responsible for the decreased stability of rna compared to dna?

The reason why the RNA has decrease stability compared to DNA is because the DNA, is lacking a hydroxyl group in which making it more stable than of the RNA, that is why RNA has decrease stability than the DNA.

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.