Why do many experiments make use of a control group?

Lydia is walking in the woods at night to observe owls. she hears a rustling behind a tree, which startles her and causes her body to go into a fight or flight response as the sympathetic nervous system is activated. what is likely to happen to her digestive system during this response? a. the enteric nervous system will speed up digestion to use energy. b. the peripheral nervous system will speed up digestion to use energy. c. the peripheral nervous system will slow down digestion to conserve energy. d. the enteric nervous system will slow down digestion to conserve energy.