Lack of oxygen delayed the rise of animals on Earth

Date:

October 31, 2014

Source:

Yale University

Summary:

Scientists have long speculated as to why animal species didn't flourish sooner, once sufficient oxygen covered the Earth's surface. Animals began to prosper at the end of the Proterozoic period -- but what about the billion-year stretch before that, when most researchers think there also was plenty of oxygen? Yale University researcher Noah Planavsky and his colleagues found that oxygen levels during the 'boring billion' period were only 0.1 percent of what they are today.

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Ancient Microbes Found in Buried Antarctic Lake

Beneath the icy surface of a buried Antarctic lake, in super-salty water devoid of light and oxygen that is also cold enough to freeze seawater, researchers have now discovered that a diverse community of bacteria has survived for millennia.

The findings shed light on the extreme limits at which life can live not just on Earth, but possibly alien worlds, scientists added.

Researchers analyzed Lake Vida, which lies encapsulated within ice at least 60 feet (18 meters) beneath Antarctica's surface. Past studies revealed the brine in the lake has been isolated from the surface for at least 2,800 years.

Read on:  http://www.livescience.com/25032-ancient-antarctic-microbes-found.html