Opposing pairs of muscles involved in moment are called?
a) tendons and ligaments
b)flexors and extensors
c) smooth and striated muscles
d) skeletal and cardiac muscles

flexors and extensors is your answer hope this helps

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.