Animal Life on Earth Delayed by Low Oxygen Levels

November 3, 2014 10:27 AM

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Scientists have long wondered why animals took so long to begin thriving on our planet, however, a recent study suggests that this delay was caused by the low levels of oxygen on Earth.

A team of scientists investigated the chemical composition of ancient rocks in order to determine the oxygen concentrations present more than 500 million years ago. According to their results, there was approximately 0.1% of the oxygen that is present now.

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