結果 : what existed 1 billion years ago
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What Happened to Earth 1 Billion Years Ago?

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A Timeline of Life on Earth: 4 Billion Years of History

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Why You Wouldn't Survive on Earth One Billion Years Ago

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Life May Have Existed A Billion Years Earlier Than We Thought!

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Plate tectonic evolution from 1 Billion years ago to the present.

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What Were The Planets Like 3.8 Billion Years Ago?

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