What chemical is the source of the oxygen produced in photosynthesis?
When William Schopf first discovered microfossils, he was able to show that ______ is/are older than 600 million years.
Banded Iron Formations (BIFs) provide evidence that the early Earth lacked oxygen because
In addition to Banded Iron Formations (BIFs), which line of evidence helped establish the timing of the Great Oxidation Event?
Uraninite forms a solid in the presence of oxygen.
The definition of mass independent fractionation (MIF) is when a reaction occurs and the abundances of different isotopes
Given a sulfur sample with the following relative abundances of sulfur isotopes (shown as δ3XS), which of the following is NOT an example of mass independent fractionation?