Question: When did the earliest organisms appear on earth?
Disambiguated questions and answers: question: When is the earliest time that the earliest organisms possibly appear on earth?
When is the latest time that the earliest organisms possibly appear on earth?
When did the earliest organisms appear on earth that we have direct evidence for?
answer: 4.54 billion years ago
4.5 billion years
3.77 billion years ago
3.465-billion-year
3.465-billion-year-old
Natural Questions answer: 4280 Ma (from the Wikipedia article "Timeline of the evolutionary history of life")