Which plant genus dominated glaciated regions during the Late Paleozoic and Early Mesozoic?

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Glossopteris was a genus of seed ferns that dominated the flora of the southern supercontinent of Gondwana during the Late Paleozoic and Early Mesozoic, including the period of glaciation known as the Permian Ice Age. Their dominance in glacial regions is attributed to their ability to survive in extreme environments and adapt to changing climates. The other options, Ginkgo, Neuropteris, and Quercas, were present during the same time period but did not have the same level of dominance in glacial regions.

Which Plant Genus Dominated Glaciated Regions During the Late Paleozoic