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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.
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Hipervinculo Biología
Covers the Cenozoic Era, the age of mammals.
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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