| 摘 要： | Millions of years ago, during the era called the Cretaceous period, the planet we call home was ruled by giant creatures that have long since disap- peared. The legacy of the dinosaurs is not only the mysteri- ous ecological environment they lived in, but also the cause of their sudden (relatively speaking) extinction. One theory suggests that dinosaurs may have passed down their distinctive DNA to birds to keep their genes alive. Buried fossils of various species provide us with an opportun…
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