This system of nerves make possible the normal motility and secretory functions of the gastrointestinal tract. what is it called

The system of nerves that is responsible for the motility in the GI tract is the myentric plexus or  the plexus of Aerbach. The system of nerves that is responsible for the secretory functions of the GI tract is the submucosal plexus or the plexus of Meissner.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?

not too sure but maybe in the hot springs.