Why did Wegener study fossils as part of his search for evidence of continental drift? If continents were once joined together, all the organisms would still be alive on all continents today.
If continents were once joined together, the same organism would have lived on different continents.
If continents were once joined together, the same organism would have gone extinct on one of the continents on which it lived.
If continents were once joined together, organisms would have moved onto only one of the continents when they separated.