Identify one hormone involved in another biological relationship and an organ that is directly affected by the hormone you identified.

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 is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.