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HOW OLD IS THE ……… Universe. Answer: 14.6 Billion Years +/- a few million years. Earth. Answer: c. 4.5 billion years ago. Cyanobacteria. Answer: c. 2.9 billion years ago. First Fossils. Answer: 3.5 Billion Years. Age of the Dinosaurs. Answer: 250-65 Million Years Ago. Megalodon.
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