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It's hard to grasp the amount of time that makes up Earth history, but it's easier to grasp if we divide it into a 24 hour day.
It is an educational content of CK-12 Foundation (to access some of the C ...
Hipervinculo Biología
Describes how scientists learn about the past by examining and dating fossils.
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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