3 Humans also have an MC1R gene, and scientists have discovered that it's one of the genes that determines the type and amount of melanin in a person's skin. If you wanted to study whether skin color, like mouse fur
color, has evolved by natural selection, what additional challenges do you imagine in collecting data or
designing experiments to explore skin color evolution in humans? Make a list of at least three additional
challenges.

thats not even an aswer choice

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.

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.