Why are photosynthetic organisms considered to be the first level of the food pyramid?

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.

it takes hundreds of years to become stable.

if you have another question lmk.