AD - Anno Domini (in the year of our lord), Anthropology - the study of human development (Anthropologist is the person who studies human development), archaeologist - An expert who studies the past by examining objects that people have left behind, Archaeology - the study of objects to learn about past human life, Artifact - an object made or used by people in the past, BC - Before Christ, BCE - Before Common Era, CE - Common Era, Century - a period of 100 years, Decade - a period of 10 years, Era - a large period of time, Evidence - Collected body of data from observations and experiments, Fossil - plant or animal remains that have been preserved from an earlier time, Historian - an expert who studies and records the past, History - the study of the past, Millennium - a period of 1000 years, Paleontology - the scientific study of fossils, Prehistoric - the time or period before recorded or written history, Species - a class of individuals with similar physical characteristics,

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