Answer:

Step-by-step explanation:

+8n +8n

Um un um i’m i’m in i’m i’m um um u me m um i’m in ...21
Answer:
Precambrian period
Step-by-step explanation:
Since the Great oxidation period = 2.4 Billion years ago era = Precambrian period.
Micro-fossils attributed to cyanobacteria are abundant during the Proterozoic that came later 2,5 billion years ago and ended 540 million years ago,
It is 1/3
3:3 =1
9:3 = 3
make sure that the top and bottom numbers divide with the same number :)