Scientists have located evidence supporting a theory that the Earth's tectonic plates have moved during the geological timeline. Which of the following would BEST support this theory?

Question

Fossilized plants and animals have been found in North America.
Fossilized remains of Mesosaurus were found in both South America and Africa.
Fossilized remains of two extinct plants were found in Montana.
A dinosaur fossil (Oviraptorosaur) of a bird-like animal was found in China.

Answer 1

The evidence that would BEST support the theory of tectonic plate movement is:

Fossilized remains of Mesosaurus were found in both South America and Africa.

Mesosaurus was a freshwater reptile whose fossils being found on both continents suggests that these landmasses were once connected, supporting the theory of continental drift and the movement of tectonic plates. The presence of the same species on separate continents indicates that they were once part of a larger landmass, which has since split apart due to tectonic movement.