paleontologist, a scientist who studies fossils to understand the ancient history of life on Earth., stability, when something stays mostly the same over time., body structure, a part of an organism (for example, one or more bones., ancestor, a related organism from a previous generation., diagnose, to classify based on scientific examination., shared structure, a body structure in two or more species that features the same parts (for example, the same bones)., fossil, evidence of life from the past, such as fossilized bones, footprints, or leaf prints., common ancestor population, an older population from which two or more newer species descended., extinct, having died out completely and no longer alive anywhere on Earth., evolution, the process by which species adapt to environmental changes over a very long time., descendant species, a more recent species that evolved from an ancestor population., evolutionary time, the very long time that spans the history of Earth, from the very first cellular life to the present., related, sharing a common ancestor population., Species, a group of organisms of the same kind (in one or more populations) that do not reproduce with organisms from any other group., Speciation, the process by which one population evolves into two or more different species.

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