"Flowering plants (angiosperms), with at least 300,000 species, are by far the most diverse group of plants on our planet. They include almost all the species used by people for food, medicine, and many other purposes.
However, flowering plants arose only about 140 million years ago, quite late in the evolution of plants, toward the end of the age of the dinosaurs.
Since then they have diversified spectacularly. However, no one knows exactly how this happened.
The origin and early evolution of flowering plants — especially flowers still remain one of the biggest enigmas in biology…"
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