A great land bridge once connected the continents. The remains were carried by ocean currents. A single landmass once existed with both continents. The animals swam across the ocean.
I gave my students this multiple choice question: Two fossils of the same species were found on two different continents. The continents are separated by the Atlantic Ocean. Scientists dated the fossils to be 2 million years old. Which is the least likely explanation for these findings?

Only one answer is correct among these 4 choices:
- A great land bridge once connected the continents.
- The remains were carried by ocean currents.
- A single landmass once existed with both continents.
- The animals swam across the ocean.

Could you tell me which one is correct?

The remains were carried by ocean currents.