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Answer:
1. earliest evidence of liquid water
2. oldest rock sample
3. first chemical signature of life
4. first cratons
5. oldest undisputed fossils
Explanation:
Earliest evidence of liquid water (4.40 Ga)
Oldest rock sample (4.03 Ga)
First chemical signature of life (3.8 Ga)
The first cratons (3.2 to 2.7 Ga)
Oldest undisputed fossils (3.2 Ga)