Consider the indicated events in the history of the universe that have helped make human life possible. Rank the events based on when they occurred, from longest ago to most recent. To rank items as equivalent, overlap them. Note: If two events occurred within seconds of each other, rank them as equivalent.
1. the Big Bang & the universe begins to expand
2. elements such as carbon and oxygen first exist
3. nuclear fusion begins in the Sun
4. earliest life on Earth
5. dinosaurs go extinct
6. earliest humans
Answers: 2
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