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Cycad

Cycads /ˈsaɪkædz/ are seed plants typically characterized by a stout and woody (ligneous) trunk with a crown of large, hard and stiff, evergreen leaves. They usually have pinnate leaves. The individua ...

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Definition

Permian

The Permian is a geologic period and system which extends from 298.9 ± 0.2 to 252.2 ± 0.5 (Million years ago). It is the last period of the Paleozoic Era, following the Carboniferous Period and preced ...