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Riddler5 Riddler5 31-35, M 5 Answers Sep 4, 2014 in Hobbies

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Blood.

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I think bloods actually blue or black or something, it turns red on air contact :)

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Oh :O, I never knew that, learn something new everyday lol

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Actually blood is red because of its iron content. Humans have almost the exact same content of iron as the Earth from which we come.

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