In 1952 franklin rosalind took a x-ray photograph shown below, which gave the world its first glance at dna. in studying this photograph, the scientists gained knowledge about the-

d. double-helix structure of DNA

Explanation:

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.

answer: dna

because all cells have genes