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Earth’s History. The Earth formed from a mass of dust and gas about ____ years ago. 4.6 billion years ago. The earliest life forms were probably similar to present day ________. Bacteria. Paleontologists call the beginning of the Paleozoic era the “Cambrian Explosion” because.

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  • 95% __________ of life in the oceans disappeared. (Give your answer as a percentage)





  • Jurassic __________ of life in the oceans disappeared. (Give your answer as a percentage)








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