What does the portion of the graph labeled B represent

a chain link fence because there so tiny even my albino donkey can't get out

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate

fumikage isn't really a bird, and tsuyu does have teeth. tsuyu has a transformation quirk which still allows her to be partially human. otherwise we'd have a large frog running around. fumikage has teeth because again, he isn't a bird. his head was a quirk mixture if i'm correct.