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The Biggest Kille? Basic

The Permian mass extinction was the biggest in Earth history. Scientists do not know what caused it but there are several possibilities.

It is an educational content of CK-12 Foundation (to access some ...

Hezkuntza-eduki gehiago eskuratu nahi dituzu?

Saioa hasi Egin bat eskola batekin
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Jokoaren laguntza
Juegos de anatomía
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