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Describe and critique the many missions of the Department of Homeland Security.
Mass Extinctions
Events in Earth's history when a significant, widespread and rapid decrease in the biodiversity of organisms occurs, often due to drastic environmental changes.
Mass Extinction
A significant and widespread event in which a substantial proportion of Earth's species die out in a relatively short geological period.
Climate Change
Substantial changes in global or regional climate patterns, notably since the late 20th century, largely attributed to increased levels of atmospheric carbon dioxide produced by fossil fuels.
End-Permian Extinction
The largest mass extinction event in Earth's history, occurring around 252 million years ago and resulting in the extinction of a significant proportion of marine and terrestrial species.
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