The idea that life originated on Mars is not really an against-the-mainstream idea, mugaliens; more like a possibility which has not yet been ruled out. If Earth-life originated on Mars and was transferred to Earth at a very early stage, then nothing much changes in the history of life on Earth, in my opinion; only if life on Mars persisted, and seeded the Earth repeatedly and over a long period, might this possibility be radically different to abiogenesis on Earth.
The chance of humanoids evolving separately on Mars is miniscule, by the way, and Mars became uninhabitable long before the Dinosaurs, so the martia-forming thing doesn't work, unfortunately..
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