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Description: Human blood = red. Octopus blood = BLUE. But why? Real biology, not myth. The 15-sec science: No Hemoglobin: We use iron-based hemoglobin → red blood Hemocyanin Power: Octopus uses copper-based hemocyanin → blue when oxygenated Why Copper? Survives in -2°C deep ocean where iron fails. 3 hearts pump this blue blood Superpower ...
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