The study by the University of Southern Denmark has scientists baffled as too the origins of life; they now think with this study of Oxgyen, that perhaps there is another reason why life started on earth.
The study suggests that there are perhaps other factors which are the reasons as to why animal life evolved on earth. They looked at metal distribution.
They found that early life, like sponges, lived on oxygen levels which were four percent of what they are today. It has led scientists to believe that life can evolve without oxgyen. Which is fascinating
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