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Plants and animals naturally incorporate both the abundant C-12 isotope and the much rarer radiocarbon isotope into their tissues in about the same proportions as the two occur in the atmosphere during their lifetimes.

When a creature dies, it ceases to consume more radiocarbon while the C-14 already in its body continues to decay back into nitrogen.

However, paleontology as a whole encompasses all life, from bacteria to whales.

Paleontology does not usually deal with artifacts made by humans.

The most common radioactive element in granite is Uranium-238.Although most of the fossils that paleontologists study are several thousands to several billions of years old, there is no absolute minimum age for a biological structure to be a fossil.Paleontologists study fossils and attempt to use them to reconstruct the history of the Earth and the life on it.Bake in the oven for about 1 hour 15 minutes or until a skewer inserted in the middle of the cake comes out clean and the sponge is golden brown and springy to the touch.If the top of the cake is getting too brown before then, cover with foil.

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