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Earth is estimated to be 4.6 billion years old and ever-changing. Scientists have organized Earth’s history into geologic time periods. These time periods include the Precambrian, Paleozoic, Mesozoic, ...
Patterns of biological evolution during the Phanerozoic Era.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
Hipervinculo Biología
Covers the Mesozoic Era, the age of dinosaurs.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
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