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On the Basis of What Americans Say,in the Last Half-Century

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On the basis of what Americans say,in the last half-century


Definitions:

Ordovician Extinction

A major extinction event that happened about 445 million years ago, marked by significant loss in marine biodiversity, possibly due to climate change and falling sea levels.

Devonian Extinction

A series of global events leading to significant reductions in biodiversity at the close of the Devonian period around 359 million years ago.

Permian Extinction

A prehistoric global event occurring about 252 million years ago, marking the boundary between the Permian and Triassic geological periods, characterized by the most significant extinction event in Earth's history where nearly 90% of marine species and 70% of terrestrial species died out.

Marsupials

Members of the mammal infraclass Marsupialia, characterized by birthing relatively undeveloped offspring that often complete their development in the maternal pouch.

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