Species - A group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce, Evolution - The process by which modern organisms have descended from ancient organisms, Fossils - The preserved remains or traces of an organism that lived in the past, Adaptation - An inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment, Natural Selection - A 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, Competition - A struggle among living things to get the necessary amount of food, water, and shelter, Mutation - Any change to the genetic material, Fitness - How well an organism can survive and reproduce in its environment, Fossil Record - All the fossils that have been discovered and what we have learned from them, Embryo - A young organism that develops from a fertilized egg (called a zygote, Homologous Structure - Similar structures that related species have inherited from a common ancestor, Extinct - A species that no longer exists and will never again live on Earth, Geologic Time Scale - The summary of Earth’s history, divided into intervals of time defined by major events or changes on Earth,

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