Question

Why is it not acceptable to say that the mesosaurus could have traversed from one continent to another via the ocean?

Answer 1

It is not acceptable to say that the mesosaurus could have traversed from one continent to another via the ocean.  Although Mesosaurus is a reptile that could propel itself through water with its long hind legs and limber tail. There is no possibility that the Mesosaurus would have the ability to swim across such a large body of ocean because it was a coastal animal.