Explain the idea that life relies on death

The idea that life relies on death is true because living things can be formed from the things which remains after the death of organisms by dead body. By dead bodies remaining material, we make many items for our survival. The other point is that the death is necessary because if the death rate will become less and birth rate will be increased then there will be shortage of needs which are essential for our survival.

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.