"how does a noncompetitive inhibitor reduce an enzyme's activity? "

What is the problem in this article? what solution does the article propose?

Milk production during breastfeeding is increased by the suckling of a newborn from his mother's nipple. this type of feedback mechanism best describes a positive or negative

Which process in respiration happens first? a)pyruvate processing b)electron transport chain c)krebs cycle d)glycolysis