Is there an animal that survives without breathing oxygen?

The Only Animal That Can't Breathe Oxygen · 4:22 · Video: SciShow · Watch at the source

In short: Oxygen is vital for almost every multicellular species we have ever studied. This video explores the unique exception to that biological rule.

While oxygen is essential for energy production in nearly every multicellular animal, researchers have identified one specific exception. This video examines the biological anomaly of the only animal known to function without using oxygen.

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