Well most certainly yes, in some way, because remember the Grineer are clones-of-clones and they are the closest looking to human beings. second would be the corpus although they do appear to be a different strain of human. However, it is noted that the Grineer do not see themselves as human beings and prefer to be called "grineer", and during the The Cicero Crisis vay hek wanted to "claim what is rightfully theirs" which could mean either simply they control earth so they 'should' claim the forests too, or because they used to be humans they 'should' in that sense.
either way yes, the original clones used to create the grineer were almost certainly a close strain of human being.
Given the lore the grineer are more than likely the result of trying to make "space humans" that is a clone species of humans that are optimised to live in little to no gravity and low atmospheres of pressure and breathable air. Obivously these traits are not natural to humans so it follows that over time as the grineer bred the genetic distortions that were kept at bay in the earliest batches of clones started to leak into the dominant traits of the species.
Then given enough time and botched genetic repair attempts you get the grineer as they are today, broken, short lived and sterile creatures who thrive in a variety of locations but constantly feel the need to validate themselves by conquoring.
^^ Except the Corpus are far more likely to be "genetic upgrades" for spaceborne life for obvious reasons, and why in the world would you use cloning for something like that anyway? Also since the setting obviously has mature artificial gravity technology, and the Orokin era seems to have left quite a few of even the most impropable outer-system objects reasonably terraformed (as in "not frozen-out airless rocks"), there would appear to be comparatively little reason to modify humans for such reasons in the first place.
The Grins sound more like the result of a "Dark Ages" warlord on Earth having stumbled onto some poorly understood ancient tech that allowed him or her to mass-produce an army of conquest which then proceeded to get badly out of hand. Probably started off as sound enough copies of the warlord's more suitable subjects, but once the degeneration from the flawed cloning process started becoming increasingly evident... well, not hard to see why they'd have had a falling out with their former boss and/or compatriots and start regarding themselves as distinct from baseline humanity.
well the corpus i imagine changed themselves with forced evolution using probably orokin technology. i wouldn't be surprised if what the corpus look like now is similar to what the orokin were supposed to look like. you have to remember that most of the teraformed stuff was already teraformed before the corpus or grineer took over, the orokin did it. the only exceptions are corpus habitation of jupiter and eris after it was infested, and grineer mining out asteroids and making them habitable. photos for example was already habitable and the grineer simply took over the area, as stated by the planets description.
so genetic modification was necessary for the corpus to stay genetically superior to the grineer, and the grineer cloning was necessary for the grineer to stay the dominant superpower by number.
22.214.171.124 wrote: When you look at the Earth it says: "Home of the oppressive Grineer Empire.". Could it be that the Grineer were originally the Humans? What do you think?
Well both Corpus and Grineer are humans , they have only separated into two factions - technology ( Corpus ) and biology-chemistry ( Grineer ) and also here areTenno , they are actually humans too , they are victims of adaptated Techonyte virus . The other form of technocyte virus create infested ... In Warframe lore it was said that the Technocyte virus was created to defeat Orokin faction but that made some unexplained things in Warframe lore since Dark Sector and Warframe lores are connected ( Can be proven by Glaive codex entry : Dating back to the time of the first Tenno, the Glaive is a uniquely deadly weapon. This multi-bladed disc is not only effective for melee combat it can also be thrown like a boomerang to cut down enemies at a distance. The first Tenno actually appeares to be Hayden Tenno ( protagonist of the Dark Sector ) because his main weapon was Glaive ( Hayden Tenno in early game wielding Glaive ) so this can prove that they are connected and also the Proto-Armor Excalibur skin with Avalon Excalibur helmet and Glaive looks exactly like Hayden Tenno ( expect the Dark Sector Glaive model looked more like circle ( PICTURE OF LATE GAME APPEREANCE OF HAYDEN TENNO VS NEMESIS / wich appears to be Nyx HERE , Glaive model from Dark Sector , Glaive model from Warframe ) . So basically everyone in this game is human ( expect Kubrows , animals , sentinels, robotics and the Orokin ) /////PLOT TWIST AHEAD BE WARNED ! /////// The thing that doesnt fit is that in Warframe lore Tenno are described as descendants of the Orokin and Infested are the only victims of the Technocyte virus and in the Dark Sector lore both Tenno and Infested are victims of the Technocyte virus but ... it can be explained by the fact that the Technocyte virus was created to fight the Orokin , so the Tenno could be the Infected Orokin ///////BIGGER PLOT TWIST AHEAD GET READY NOW /////// but in the Dark Sector lore the Technocyte virus was created in the cold war and in the Warframe lore the Technocyte virus was created to fight the Orokin , the only explaination to this ( from my side ) is that in the Dark Sector the cold war was humanity vs The Orokin ( could be aliens ) , but Mezner can control the Technocyte virus victims so ... it can be explained that Orokin created the Technocyte virus to get rid of the humanity but humanity modified the Technocyte virus to be the death of the Orokin ... So that would make Lotus Mezners daughter or something because she comunicate with Tenno by the same way as Mezner communicated with Technocyte virus victims .... ( I know there are many things that doesnt fit but its not my bad , they need to the Warframe lore to give some sense , at last break the connection with Dark Sector lore , but that would be impossible because of the faction is already called after the Dark Sector protagonist ) ( I could make some mistakes when i was writing this if you will discover a mistake i did dont flame me , am just human , not a Corpus robotic , i can do mistakes
actually they are humanoid, not human beings. there actually are no presumed "human" species in the game. they may be decedents from human beings, but even the grineer clones were probably already a different strain of species before beginning to start mass cloning operations. the red veil may be the only strain that are the closest to humans but other than their chin we don't see their true forms either.
you lost me when you said that dark sector was connected to warframe. it's not, other than the fact that warframe rips off dark sector because it's made from the same company (warframe rips off it's other game unreal tournament too, dosn't mean unreal tournament is warframe lore), dark sector is simply in a different universe. unless DE comes up with an official way to connect the games in the actual game (props and cosmetics don't count) they are different games. You have to remember that dark sector was a partial failure for the DE team in a way, and warframe is what they meant dark sector to be. so yeah, it purposely rips off material from dark sector because warframe is a spiritual successor.