Certain bacteria living in a human's large intestine to produce vitamin k. the intestines are a safe place for the bacteria to live, with plenty of food available. this relationship is an example of a) animal parasitism. b) plant parasitism. c) commensalism. d) mutualism.

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.