Yes; all animals breathe oxygen. Both plants and animals “require oxygen for respiration.”
Animals that don’t require oxygen to breathe are called ‘anoxic animals’. There has been a recent discovery of a multicellular lifeform which doesn’t require oxygen to breathe – they’re a sub-species of Loricifericans and microscopic. Loricifera are one of the newest lifeforms to be discovered. They were found in 2010 on the Mediterranean Sea floor.
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