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The little mermaid one didn't make sense to me, they're under water probably 95% of their lives getting no sun. They all were definitely pale.
You're applying scientific principles to human skin and UV exposure response with regards to evolution and calling into question the scientific accuracy of the portrayal in the mermaid, and that leads you to disagreeing with the skin color of the actor.
With your scientific explanation you missed a couple key points if your goal is accuracy to the biological world:
You didn't call either of these out as scientifically inaccurate.
Can I ask why your scientific explanation of the mermaid was only skin color?
The "underwater therefore white" doesn't hold much water, in my opinion.
What about all those dark-colored creatures? Tuna, whales, squids?
Fish colors have nothing to do with melanin which determines human skin tone.
Why do mermaids have to follow human skin tone rules instead of other aquatic mammals? Even if they're humans who evolved a fish tail, they've been underwater long enough for melanin to not be the deciding color.....
So what?
Bro, we're talking about a fictional creature.
Plus "fish color" is just one attribute. I also mentioned whales and squids.
And we don't even know how humans would evolve to live underwater.
Do black people lose their pigmentation completely if they stay indoors?
I mean given enough time and generations, yes.
Existing circumstancial evidence suggests that if you give them somewhat around forty to eighty thousand years they might lose at least some of it, depending on how much exposure to solar radiation they get... though interbreeding with Neanderthals and/or Denisovans might also help, too.
I read somewhere else that a Japanese study suggests 500 years is enough for skin tone to change.
I would question the validity of that research; the Japanese still have a lot invested in the idea they are somehow different from other people, nearby East Asians particularly. They literally think they have a lower body temperature, for example.
To my understanding, the study only focused on the natives of Japan that stayed secular in comparison to the rest of their population. I do not remember their name, but the Japanese version of native americans.
A... shit I've forgotten too! Ainu! I think?
They weren't "definitely" anything. They're fictional creatures.