Until about 200 million years ago, Earth's continents were joined as a single land mass called

a. Pangaea.

b. Asia Minor.

c. Cynognathus.

d. Glossopteris

Earth's continents were joined as a single land mass, one supercontinent called Pangaea. Thi supercontinent was surrounded with an single ocean. The movement od the tectonic plates resulted in separation of Pangaea in several continents. Supercontinents were formed many times in Earth's history.