What color is octopus blood?

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Both squids and octopuses have blue blood. They use an oxygen-carrying molecule in their blood called hemocyanin that contains copper. In cold conditions with low oxygen pressure, hemocyanin oxygen transportation is more efficient than haemoglobin oxygen transportation.
Kasia
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Very interesting!
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36
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30
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23779
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29
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1177
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12%
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54
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1458
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31
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19%
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126
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56%
13%
9%
123