Question

How long ago is it estimated that the common ancestor for all of life existed?

A. Between 350 and 380 thousand years ago
B. Between 3.5 and 3.8 million years ago
C. Between 3.5 and 3.8 billion years ago

Answer 1

The common ancestor for all of life is estimated to have existed between 3.5 and 3.8 billion years ago.

Step-by-step explanation:

The common ancestor for all of life is estimated to have existed between 3.5 and 3.8 billion years ago. The first life forms on Earth were single-celled organisms similar to bacteria, which appeared about 3.5 to 4 billion years ago. These early life forms eventually evolved into more complex organisms over time.