Sea urchins spread oxygen in a unique way. They take in oxygen by staying. After their exposure to high temperatures, acidity, low oxygen or combinations of the three, the researchers flipped the urchins upside down. When a sea urchin is flipped, it usually. When the oxygen level is low in a purple sea urchin, muscles associated with aristotle's lantern pump fluid through its body (through the canals).
Thus, few species could exist without oxygen.
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