Question

Question 9 (3 points)

When did Cyanobacteria appear on Earth?
Ordovician period
Silurian period
Permian period
O Precambrian period

Answer 1

Precambrian period

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,