when Florida collided with the North American continent. the date when organisms moved onto dry land. the period during which Florida was covered in water. when the atmosphere of Earth was more humid than it is today.
I gave my students this multiple choice question: Rich beds of marine fossils have been found in Florida. By dating these fossils, scientists can best determine

Only one answer is correct among these 4 choices:
- when Florida collided with the North American continent.
- the date when organisms moved onto dry land.
- the period during which Florida was covered in water.
- when the atmosphere of Earth was more humid than it is today.

Could you tell me which one is correct?

the period during which Florida was covered in water.