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.