What happens in the alimentary canal? a)white blood cells grow b) starch is broken down by enzymes c)carbon dioxide is released by hemoglobin d) actin and myosin are produced

 Starch is broken down by enzymes or  Nutrients are absorbed into the bloodstream.

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.