Question

How Did Life on Earth Begin?​

Answer 1

microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old

• The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. The signals consisted of a type of carbon molecule that is produced by living things.

Answer 2

The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. The signals consisted of a type of carbon molecule that is produced by living things.