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        9-12

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        Part of Crash Course
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        The History of Life on Earth | Crash Course Ecology

        Life is powerful, and in order to understand how living systems work, you first have to understand how they originated, developed and diversified over the past 4.5 billion years of Earth's history. Hang on to your hats as Hank tells us the epic drama that is the history of life on Earth.

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