system
Given the following post, respond as if you're commenting on Reddit:
human
[Man of Steel] What theories do the scientific community have about the Kryptonians/Atlanteans/Amazonians?

With the recent attack on Earth by kryptonian forces and the subsequent discovery of subject Superman, we have learned that we are not alone in this universe.  Recently we have discovered two more species that inhabit the Earth, the Atlaneans and the Amazonians. We need some theories as to what we are dealing with. 

Coming from a strictly scientific viewpoint, what are the most likely origins of these two races of technologically advanced superhumans?  

How did their technology become so much more advanced than ours?

Why do the current known alien species (Kryptonians, Amazonians, and Altanteans) look like humans? 

What are the sources of their super-human abilities? 

What will be their current role be in the geopolitical community?

(//4th// The new tone of the reboot is a realistic one, and a JL movie may come within the next few years, so what would be the most accurate predictions the scientific community would make in this scenario assuming they know the basics of Amazon and Atlantean society and all of what Superman knows about his people.  Yes I know in the comics the Amazonians literally came from gods, but what would a level headed scientist think?) 

tldr: Whats up with all these people on Earth that aren't strictly speaking, human?
gpt
The people of Atlantis have evolved to have a body that can hold up to the pressure of being at the bottom of the ocean, they likely can't breathe air at all since they stay in water mostly, and if they can it may be tough for them to breathe. There's a good chance they're able to see in darker light levels since the ocean isn't the brightest place.