Examlex
The terrestrial celestial object _________________ is most like Mercury.
Permian Extinction
A massive extinction event occurring about 252 million years ago, marking the boundary between the Permian and Triassic periods, and resulting in significant loss of species.
Carbon Dioxide Levels
The concentration of CO2 in the Earth's atmosphere, an important factor influencing climate change and global warming.
Marine Diversity
The variety and variability of life forms within ocean habitats, ranging from microscopic plankton to large marine mammals.
End-Cretaceous Extinction
A significant global extinction event approximately 66 million years ago, marking the end of the Cretaceous Period, characterized by the mass extinction of dinosaurs among other species.
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