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Question 9 (3 points)
When did Cyanobacteria appear on Earth?
Ordovician period
Silurian period
Permian period
O Precambrian period

Respuesta :

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,

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