# Scientists Identify Metabolic Factor in Earth's Greatest Mass Extinction
Researchers have identified a key role that metabolism played in Earth's greatest mass extinction event, which occurred 252 million years ago. According to a new study, the organisms' ability to use oxygen and generate energy determined which species survived this ancient crisis, with those having lower metabolic demands faring better than more active creatures.
The extinction event coincided with warming oceans and declining oxygen levels. Less active ancient marine life were particularly stressed by these environmental changes, while more mobile animals with higher metabolic requirements faced greater pressure to survive. The research suggests that an organism's energy demands and oxygen consumption were critical factors in determining whether it would persist through this catastrophic period.
This discovery provides significant insight into one of paleontology's major questions: what caused the Permian-Triassic extinction, which eliminated the majority of marine species at that time. The findings underscore how environmental stress combined with biological characteristics can drive large-scale extinction events, offering a framework for understanding how species respond to rapid environmental change.
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