Question

In order to determine when oxygen levels increased in the Earth's atmosphere, which element did James Farquhar and his team search for in rocks?​

Answer 1

Sulfur

Step-by-step explanation:

Sulfur commonly exists as a combination of several forms (isotopes) of the element. A few years ago, Farquhar discovered that the photochemistry of Earth's early atmosphere produced sulfur that had a slightly different ratio for three of these isotopes.