Blue-Blooded Octopuses: the Strange Secret that Would Make Them Lethal if They Were Human

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Although it sounds like science fiction, octopus have blue blood because instead of iron, like humans, their blood contains copper. This metal allows them to transport oxygen into the cold depths of the ocean, where pressure and extreme temperatures do not give respite. But here the twist: if a human had copper blood, toxicity would be lethal. A further reminder that nature has amazing – and very different – ways to survive and evolve. With info…