UCR Today (press release) | Lack of oxygen delayed the rise of animals on Earth EurekAlert (press release) Geologists are letting the air out of a nagging mystery about the development of animal life on Earth. Scientists have long speculated as to why animal species didn't flourish sooner, once sufficient oxygen covered the Earth's surface. Animals began to ... Oxygen levels were only 0.1 percent of today's levels for roughly billion ... Why Didn't Animals Appear Sooner in Earth's History? Oxygen Levels Delayed the Appearance of Animals |
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