Probiotics are beneficial bacteria or yeast applied to maintain intestinal health in humans or livestock. In theory, these organisms inhabit the intestines and aid in digestion of food. Also, these organisms have bioprotective effects. How can addition of bacteria to the intestine protect the host from disease?
(A) Probiotic bacteria crowd the intestine, preventing pathogenic bacteria from growing due to densitydependent limitation on their population.
(B) Probiotic bacteria crowd the intestine, preparing a niche for pathogenic bacteria to grow.
(C) Bacteria populations grow exponentially until the carrying capacity is reached.
(D) Pathogenic bacteria do not recognize the intestinal cells because they are coated with probiotic bacteria.