archeology - the study of the past based on what people have left behind, artifact - an object left behind by people of the past, history - the written or recorded events of people, pre-history - the time before humans had written records of history, Ice-Age - a long period of cold weather where huge sheets of ice covered parts of the Earth, Stone Age - a time in history when humans made tools and weapons from stone, hunter-gatherer - a person who gathers plans and hunts animals for food, clan - a group of people who travel together for a common purpose, migration - movement from one place to another, usually to follow a food source or climate, pictograph - painted drawings by early man, petroglyph - carved drawings by early man, nomad - a person who roams from place to place, with no permanent home, land bridge - a narrow strip of land that joins two large land masses, adapt - to change in response to something, fossil - the remains or impression of a living thing preserved or petrified long ago, Neanderthal - an extinct species of pre-historic man,

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