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How do archeologists add to our knowledge of history ?

asked Apr 17, 2017

History
high-school

2 answers

2 votes

99.0k views

During the evolution of life on Earth, the photosynthetic organisms initially responsible for raising atmospheric oxygen concentrations from less than 1 percent to about 20 percent were (A) cyanobacteria

asked Jun 8, 2015

Biology
high-school

1 answer

2 votes

54.1k views

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