Help please :PP What evidence supports the Law of Conservation of Mass?
Don`t copy from the internet.

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.

the real answer is b. scintillation counter

not always but somethings can be reproduced in a laboratory.