The answer is simpler than that.
Mars is too small, the core cooled off billions of years ago and lost its electromagnetic field. Leaving it to the mercy of the solar wind which blasted off the atmosphere and water.
What do you mean "what if"?
Actually, it was a different species of beings but they did colonize earth. Early humans were already here (Homo neanderthalis, Homo erectus, etc) and the Martians found that they could domesticate them for use as cattle and slave labor in their mining operations.
Through genetic tampering to try to make the early humans smarter and more docile, the aliens accidentally created Homo sapiens.
Unfortunately for the Martians, H. sapiens turned out to be anything but docil and soon overpowered and eliminated all the other human species and eventually the Martians themselves.
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Tis not. God is the one and only.
Mars is too small, the core cooled off billions of years ago and lost its electromagnetic field. Leaving it to the mercy of the solar wind which blasted off the atmosphere and water.
Actually, it was a different species of beings but they did colonize earth. Early humans were already here (Homo neanderthalis, Homo erectus, etc) and the Martians found that they could domesticate them for use as cattle and slave labor in their mining operations.
Through genetic tampering to try to make the early humans smarter and more docile, the aliens accidentally created Homo sapiens.
Unfortunately for the Martians, H. sapiens turned out to be anything but docil and soon overpowered and eliminated all the other human species and eventually the Martians themselves.