Blue-green algae originated about ______ years ago.(a) 1.5 billion(b) 2.5 billion(c) 3.5 billion(d) 4 billionThis question was addressed to me in examination.I'd like to ask this question from A Brief Account of Evolution of Plants in portion Evolution of Biology – Class 12

Blue-green algae originated about ______ years ago.(a) 1.5 billion(b)

1.	Blue-green algae originated about ______ years ago.(a) 1.5 billion(b) 2.5 billion(c) 3.5 billion(d) 4 billionThis question was addressed to me in examination.I'd like to ask this question from A Brief Account of Evolution of Plants in portion Evolution of Biology – Class 12
Answer» Right option is (a) 1.5 BILLION Explanation: Prokaryotic form of life was FORMED. Also, blue-green algae originated about 1.5 billion YEARS ago. They evolved during the ARCHAEOZOIC ERA.

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