Researchers found that over the course of its evolutionary process, the animal has been able to survive by eliminating so many of the traits associated with multicellular species.
Researchers have discovered the only known animal that does not need oxygen to survive, a common parasite that largely preys on salmon., found that the parasite Henneguya salminicola does not require aerobic respiration in order to survive — a revelation that may change how we understand life on Earth and beyond.
The multicellular organism, which is part of a group of animals closely related to jellyfish known as the Myxozoa, does not breathe at all and does not have mitochondrial DNA. It's the first multicellular animal found in the wild to not have the DNA, which contains the genes responsible for respiration, and has lost"the ability to perform aerobic cellular respiration," per the study. Some single-celled organisms do not need respiration to survive.
A study published in 2010 speculated that a species of loriciferans, another microscopic animal, can survive without oxygen, though, this finding has not been fully confirmed,
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