Asteroid that doomed the dinosaurs halted a key process for life on Earth, scientists say - CNN

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Asteroid that doomed the dinosaurs halted a key process for life on Earth, scientists say (https://news.google.com/rss/articles/CBMiZ2h0dHBzOi8vd3d3LmNubi5jb20vMjAyMy8xMC8zMC9hbW VyaWNhcy9hc3Rlcm9pZC1kdXN0LWRpbm9zYXVyLWV4dGluY3Rp b24tcGhvdG9zeW50aGVzaXMtc2NuL2luZGV4Lmh0bWzSAWtodH RwczovL2FtcC5jbm4uY29tL2Nubi8yMDIzLzEwLzMwL2FtZXJp Y2FzL2FzdGVyb2lkLWR1c3QtZGlub3NhdXItZXh0aW5jdGlvbi 1waG90b3N5bnRoZXNpcy1zY24vaW5kZXguaHRtbA?oc=5) CNN

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