The great explosion in flowering plants during the Cretaceous period is one of the great enigmas of evolution.
Charles Darwin had no explanation, calling it an 'abominable mystery'.
But now scientists think they've solved the riddle of how flowers came to dominate the conifers and ferns that preceded them.
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Earth's 4.5-billion-year history is filled with several turning points when temperatures changed dramatically, asteroids bombarded the planet and life forms came and disappeared. But one of the biggest moments in Earth's lifetime is the Cambrian explosion of life, roughly 540 million years ago, when complex, multi-cellular life burst out all over the planet.
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