is there any animal which is invincible and can survive with the lack of oxygen 

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Besides some bacteria, one group of animals that can live without oxygen is that of Loriciferans. They live at the bottom of the sea.
World's toughest creature which could be called invincible is Tardigrade (water bears). 

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Loricifera
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I don,t think so that there is any animal which is invisible but there is a animal named tardigrade it was taken to space with nasa and it could survive 1 day without oxygen
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No there is no animal which is incisible but , it was previously thought that only viruses and single-celled microbes could survive without oxygen long-term. But three new species of multicellular animals found during recent research expeditions live comfortably in oxygen-free depths, said team leader Roberto Danovaro of Italy's Polytechnic University of Marche.
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No there is no animal which is incisible but , it was previously thought that only viruses and single-celled microbes could survive without oxygen long-term. But three new species of multicellular animals found during recent research expeditions live comfortably in oxygen-free depths, said team leader Roberto Danovaro of Italy's Polytechnic University of Marche.
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hope  it helps
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