In the phylogenetic tree shown here, which of the following loci represents an ancestor shared by species 1 and 2 but not by species 3? A. C
B. A
C. B
D. D

are there any answer choices

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.

for a different answer set the answer would be because the oxygen in the water had depleted (apex)