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.
You do K12 I guess. Here you go
The north and south differ in the first half because industrialization
happened mostly in the Northeast while cotton production excavated the South’s need
on slavery. So we can say that South focused on agriculture while the North
focused on industries. These two geographical areas industrialized in different
ways, generating a complicated political environment.
Answer:
The United Nations General Assembly (UNGA or GA; French: Assemblée Générale, AG) is one of the six principal organs of the United Nations (UN), the only one in which all member nations have equal representation, and the main deliberative, policy-making, and representative organ of the UN
Explanation: