This is one of the reasons why, for example, we tire more quickly from exercise at high altitudes. The iron-based protein (hemoglobin) that carries oxygen in the blood for us red-blooded vertebrates becomes ineffective when faced with low-oxygen levels. And new research shows how genetic alterations in this odd-colored blood have helped the octopus colonize the world's wide oceans-from the deep, freezing Antarctic to the warm equatorial tropics. Octopuses' oddities run deep-right down to their blue-hued blood.
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