Which statement is scientifically based? Ο Ο
O O
Mutations rarely occur.
All mutations are harmful.
Some mutations can be contagious, like infections.
Mutations are not passed from parent to offspring?

answer; i believe its echoic memory,it is believed to last three to four seconds; good luck

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.