Which feature provides structure and form to plants? a. plants have an exoskeleton, like insects. b. plants have an internal skeleton of bones. c. plants have rigid tubes made of cellulose. d. plants have an external covering that keeps them upright.

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.

c should be the answer