Which of the following best defines gene flow

Gene flow is a concept in population genetics to refer to the movement of genes between interbreeding populations of a specific species.

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.