'This sixth & last period of the Paleozoic era saw the birth of the reptiles'
permian
NICE PERM, TREBEK: This sixth & last period of the Paleozoic era saw the birth of the reptiles
This sixth & last period of the Paleozoic era saw the birth of the reptiles
This sixth & last period of the Paleozoic era saw the birth of the reptiles
NICE "PERM", TREBEK
permian
NICE "PERM", TREBEK