Summary
A loss of carbon dioxide from the atmosphere more than 300 million years ago may have led to the appearance of leafy plants, scientists said today.
The genetic foundations of leaf development evolved about 400 million years ago, yet leaves did not become widespread for another 20 million years.See the full content of this document
Extract
Plant Life May Be Due to Gas Level
Researchers said today the delay was probably due to exceptionally high le...
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