Damage to which structure will most directly disrupt water balance within a single-celled organism? A characteristic common to both diffusion and active transport is that

your answer is going to be physical weathering

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.