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Giant fern forests, which thrived during the Paleozoic era, largely declined due to significant shifts in climate and atmospheric conditions. The rise of flowering plants and conifers during the Mesozoic era outcompeted ferns for resources, leading to a decline in their dominance. Additionally, changes in soil composition and the evolution of herbivorous animals that grazed on these plants contributed to their disappearance. Lastly, fluctuating carbon dioxide levels and global temperatures altered habitats, making them less suitable for giant ferns to thrive.

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1mo ago

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