The Study of 2-3 Billion Year Old Banded Iron Formations

The study of 2-3 billion year old banded iron formations shows that

A) the amount of oxygen in the Earth's atmosphere has remained constant throughout its history
B) Earth's atmosphere contained much more oxygen in the past compared to today
C) there was no oxygen in the Earth's atmosphere at that time
D) Earth's atmosphere contained much less oxygen in the past compared to today

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