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fossil: Remains or traces of an organism turned to stone by geochemical processes.
hominid: A member of the family of primates that includes humans, their ancestors, and close relatives.
Homo sapiens: The taxonomic name for our species: modern humans.
mutation: A change in a gene’s structure that may be passed on to future generations.
population: A group of organisms of one species, occupying a defined area and usually isolated from other groups of the same species.
symbolic thought: The ability to interpret and re-create the world mentally using symbols. Evidence of symbolic thought includes language, music, art, and complex tools and technology.
trait: Any genetically determined characteristic.

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