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Put these events in Earth history in order.
Oldest < second oldest < ... < youngest:
1. production of oxygen by photosynthetic organisms
2. rigin of eukaryotic cells
3. earliest evidence for life on Earth
4. appearance of first tetrapods on land surfaces
5. Cambrian "explosion"
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Put these events in Earth history in order.
Oldest < second oldest < ... < youngest:<...
Oldest < second oldest < ... < youngest:<...
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