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Gene Analysis From Living Plants Have Pushed The Date For The Evolution Of Earliest Plants To 500 Mya (About 100 Mya Earlier Than The Date From Fossilized Plants). These Earliest Plants, Which Evolved From Pond Scum, Created An Environment With Life Sustaining Oxygen And Temperature Conducive For Land Animals To Emerge.

Origins of land plants pushed back in time – BBC News

http://www.bbc.com/news/science-environment-43116836

Plants appeared on land 100 million years earlier than previously thought, according to new research.