Hundreds of millions of years ago, the Earth was dominated by ferns and conifers. Then, about 150 million years ago, the first flowering plants appeared on the scene.
They quickly spread to all parts of the world, changing the landscape from muted green to a riot of vibrant colour.
Plants
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Image caption,
Angiosperms are the most diverse group of land plants, with hundreds of thousands of known species
The reasons behind the incredible success and diversity of flowering plants have been debated for centuries.
Charles Darwin himself called it an "abominable mystery", fearing this apparent sudden leap might challenge his theory of evolution.
Simonin and co-researcher Adam Roddy, of Yale University, wondered if the size of the plant's genetic material - or genome - might be important.
The biologists analysed data held by the Royal Botanic Gardens, Kew, on the genome size of hundreds of plants, including flowering plants, gymnosperms (a group of plants, which include conifers and Ginkgo) and ferns.
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