Question

Based on fossil evidence, about how long ago did the first single-celled life form appear on Earth?
130 million years ago
1.5 billion years ago
2.5 billion years ago
4.1 billion years ago

Answer 1

Answer:

4.1 billion years ago

Explanation:

It is shown in the timetable 4.1 bya Single celled life

Answer 2

4.1 billion years ago

An ancient zircon crystal unearthed in Western Australia may hold evidence that life appeared on the planet 4.1 billion years ago, or about 300 million years earlier than previously thought, according to a team of US researchers.

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