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,
Get a ruler. and do 8 lines with maybe each being 2 inches.
I think the answer is 6 or 9 Because the minimum is 3 I hope this helps.


distributed
choose 1 as your lowest positive integer
plug 1 into a and b
1 + 1 + 1 + 1