Scientists can determine if oxygen existed in Earth’s Archean atmosphere by looking for oxidized iron in rock. In the beginning, there was only a little to no oxygen in the atmosphere. The oxygen that are being produced by cyanobacteria is only enough for the weathering process. There will only enough oxygen that shall remain in the atmosphere when the rocks at the surface are properly and adequately oxidized. However, as time goes by, evidences said that the amount of oxygen in the Archean atmosphere is actually increasing in a slow steady pace.
The answer is ability to ratify treaties. The Senate favors
or rejects a resolution of ratification. If the resolution permits, then
ratification undertakes when the instruments of ratification are officially swapped
between the United States and the foreign power(s).
