In many aquatic vertebrates reproduction involves external fertilization. what is a characteristic of this type of fertilization.

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.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.