Imagine That You Built a Time Machine and Successfully Traveled

question 33

Multiple Choice

Imagine that you built a time machine and successfully traveled 2 billion years back in time. What would you observe, given our current understanding of Earth's history?

• A) dinosaurs roaming Earth
• B) forests and insects everywhere on Earth
• C) the ongoing heavy bombardment of Earth
• D) a severe scarcity of oxygen in the atmosphere
• E) You would be floating in space because Earth hadn't formed yet.

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