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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