Q: The first living cells may have evolved around how long ago?


Read this paragraph and choose the correct option from the provided answers:

The Precambrian Supereon (4.6 billion–544 million years ago) is the first major division of the geologic time scale. The first living cells may have evolved around 4 billion years ago. By 1 million years ago, the first multicellular eukaryotes had evolved. The Precambrian ended with the first of six mass extinctions that occurred during Earth’s history.

 Choices:

- 900,000 years

- 6 billion years

- 2.2 billion years

- 4 billion years


A:
4 billion years