Natural selection, Organisms with the most beneficial traits are more likely to survive and reproduce., Evolution, the gradual change over time, Charles Darwin, a scientist created the theory that evolution happens by natural selection, Offspring, Another word for an animal's young ('children'). , Traits, Characteristics, like hair and eye color, that are passed on to offspring. , Extinction, the dying out of a species, Fossils , remains or imprints of a once living organisms found in rock layers, Lamarck, Scientist who believed characteristics inherited during organisms lifetime were passed on, Adaptation, A trait that helps an organism survive and reproduce, Radiometric dating, determining the age of a fossil based on how much radioactive material it contains, Relative dating, determining if one rock/layer is older or younger than another, without knowing their specific age.

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