Science has long thought that multicellular life needed oxygen to survive. It turns out that assumption was wrong as a new DNA information on a parasite has been discovered about a parasite described as jellyfish-like. The parasite lacks the mitochondrial genome and is the first known multicellular organism to lack that genome.
Lacking the mitochondrial genome means that the parasite doesn’t breathe and needs no oxygen to survive. Scientists note that not only does the discovery change how life can work on Earth, it also has implications in the search for extraterrestrial life. Scientists say that life started to metabolize oxygen over 1.45 billion years ago.
src - https://www.pnas.org/content/early/2020/02/18/1909907117
ref https://www.slashgear.com/new-discovery-reveals-a-parasite-that-needs-no-oxygen-to-live-26611266/ https://www.sciencealert.com/this-is-the-first-known-animal-that-doesn-t-need-oxygen-to-survive
origin - https://www.pipiscrew.com/?p=17191 new-discovery-reveals-a-parasite-that-needs-no-oxygen-to-live