Will Ronda Rousey hypothetically defeat X-Men's Colossus in a fight? Hmmm, my chain of thoughts:
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Ronda Rousey is a mixed martial artist and wrestler. Ronda Rousey relies on striking moves and submission tactics to dominate her opponents. X-Men's Colossus has the ability to change his appearance. Colossus's mutation allows him to create an organic steel layer, that acts as an impenetrable external shell. Final answer: no.
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