Understanding oxygen concentrations 1.4 billion years ago

ENN
Jan 6, 2016, 7:07 am45 pts
Oxygen is crucial for the existence of animals on Earth. But, an increase in oxygen did not apparently lead to the rise of the first animals. New research shows that 1.4 billion years ago there was enough oxygen for animals - and yet over 800 million years went by before the first animals appeared on Earth.

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