They were the dominant vertebrate life form in Paleozoic times.
Amphibians were the dominant vertebrate life form
The Appalachians in the eastern United States Explanation: These ancient mountains are 480 million years old. These mountains have been modified by plate collisions. The effects of plate collisions are still visible to this day.
During the late Paleozoic, continental collisions formed the supercontinent of Pangea and resulted in some of the major mountain ranges including A. Appalachia, Urals, and Tasmanian Mountains.
Ferns were the dominant plant form in Paleozoic times
Super continent Pangea (Answer), which created mountains like the Appalachians.
Answer 6
So that would be C. Appalachia