/newsroom/taxonomy/term/17375/all en /newsroom/channels/news/what-rise-oxygen-early-earth-tells-us-about-life-other-planets-337051 <p>When did the Earth reach oxygen levels sufficient to support animal life? Researchers from ºÚÁϲ»´òìÈ University have discovered that a rise in oxygen levels occurred in step with the evolution and expansion of complex, eukaryotic ecosystems. Their findings represent the strongest evidence to date that extremely low oxygen levels exerted an important limitation on evolution for billions of years.</p> Mon, 24 Jan 2022 21:23:08 +0000 shirley.cardenas@mcgill.ca 284911 at /newsroom