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The soil in a bog is very low in nutrients and oxygen.

Animals that die in bogs and sink beneath the surface are protected from the elements, other animals, and bacteria that cause decay.

The mold is an empty cavity, and can be filled with minerals that become a cast for the long dissolved bone.

Bogs are another place where animal remains can be well preserved.

A bog is a type of wetland where a large amount of dead plant matter accumulates.

Though there is no one age, a good rule is anything over 10,000 years old can be considered a fossil.

The oldest fossils ever discovered are more than 3.5 billion years old.

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