What was the first and longest era in Earth's history?

Keep practicing — related questions

• Which of the following is the most ancient eras of Earth's History?
• The largest extinction in Earth's history occurred at the end of which era?
• What was the second era in Earth's history that started with an Explosion of Life?
• In the Geological time line which era comes first?
• In which era the origin of life took place?
• In which era did the first mammals appear on the earth?
• The first Earth Summit was held at
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