What level of organization is shown here (human heart)

"do a testcross with a homozygous recessive plant."

me and my friend did 2

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.