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Reaching stability involves the process of radioactive decay.

This smaller nucleus is easier to keep in a stable form. In negative beta decay, the nucleus contains an excess of neutrons.

Vertebrate Paleontology: Study of vertebrate fossils, from primitive fishes to mammals.

Human Paleontology (Paleoanthropology): The study of prehistoric human and proto-human fossils.

They have the same ratio of carbon-14 to carbon-12 as the atmosphere, and this same ratio is then carried up the food chain all the way to apex predators, like sharks.

Paleontology is a rich field, imbued with a long and interesting past and an even more intriguing and hopeful future.