Just wanted to point it out that Argonians being from blackmarsh should have better underwater visability
I have not seen anyone say anything about this yet but if you were a argonian living in a murky swamp dont you think swimming in a ocean you would see better than a human(underwater) who lives and is use to being outside the water?

also I know it would be hard to do but Khajiit should also be able to climb better than humans because cats are far more agile maybe jumping farther and higher and swift movement like a ninja

I thought animals like crocodiles used scent to hunt underwater, like a shark or something. I've never really thought about whether they could actually see through muddy water better than humans.

But I am of the opinion that like real-world cultures, real-world biology (and any other science like chem or physics) should not be expected to translate precisely into the TES-world;

Argonian briasts, 'nuff said.

And your comment about the khajiit is already established in TES. Pre-Skyrim, when acrobatics was still a skill, Khajiits had the greatest racial bonus to the acrobatics skill than any other race. So we already know they are naturally gifted leapers.

On that note, slit eyed reptiles probably see in black and white and some snakes use infrared. Cats can also see in the dark well. But who is to say whether the beast races have more animal or humanoid qualities?

Argonians also evolved from trees. Like PeteAtoms said, real-world biology doesn't always relate to in-game biology.