Question

"How do we know that organisms existed millions of years ago"?​

Answer 1

Answer:

There is evidence in fossils, the scientists can scan the fossil to see the date.

Explanation:

hope this helps

Answer 2

Answer:

We know that organisms existed millions of years ago by the artifacts and remains that they have left around us.

Explanation:

We find those remains by archaeologist, and they dig up the remains that the people left back then.