What prevents bacteria and materials in the large intestine from flowing backward into the ileum of the small intestine?

answer; ///(b) it is composed of four protein chains and four heme groups;

if, i suppose that a bee stings me swinging my hand away from a bee. then that if, i persist patient when a bee or wasp areas on your surface to investigate a scent or to take h2o and i secreting heavily, the bug ultimately will move of its personal agreement. if i don't need to set for it to disappear, lightly and gently wipe it off with a part of the paper.