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Extinction | Definition & Examples | Britannica
Extinction - Wikipedia
Extinction - National Geographic Society
Extinct species, facts and information - National Geographic
What is extinction? The answer is complicated. - National …
Mass extinction facts and information from National Geographic
What We’ve Lost: The Species Declared Extinct in 2020
Extinction - National Geographic Society
Biodiversity: What is a mass extinction and are we causing one?
What is the sixth mass extinction and what can we do about it?