Trait - A characteristic of an organism; can be inherited (genetic) or acquired in a different way, Natural Selection - The process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species, Extinction - When a species no longer exists - can be due to a variety of factors, Common Ancestry - When organisms are descended from a single ancestor, Homologous Structure - Similar anatomies (structures) because they were inherited from a common ancestor, Analogous Structure - Similar traits because of similar environments and NOT because of a common ancestor, Vestigial Structure - Traits that are inherited from common ancestors but because of environmental changes they are not needed anymore, Species - A group of similar organisms that is able to successfully reproduce, Adaptation - 1 : the act or process of changing to better suit a situation. 2 : a body part or feature or a behavior that helps a living thing survive and function better in its environment., Variation - any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences or by the effect of environmental factors, Evolution - species change over time in order to survive where they live, Mutation - a change in a living thing's DNA, Convergent Evolution - when two species from unrelated lines develop the same traits or features, Fossil Record - collection of fossils in the Earth's crust and their placement in chronological order, Law of Superposition - each layer of rock is older than the layer above it and younger than the rock layer below it, Principle of Crosscutting - if a fault or other body of rock cuts through another body of rock then it must be younger in age than the rock through which it cuts and displaces., Relative Age - the age of an object or event by comparing it to another object or event, Absolute Age - the exact age of an object or event,

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