The species name for modern humans, meaning "wise man.", Homo sapiens, The remains or imprints of organisms from a past geological age, such as bones or teeth., fossils, Human-made objects, such as tools or pottery, from a past culture., artifacts, The period of time before written records existed., prehistory, A scientist who studies human history by digging up and analyzing artifacts., archaeologist, Also known as the Old Stone Age, this period began around 2.5 million years ago and lasted until about 8000 B.C., Paleolithic Age, A group that includes modern humans and all extinct species more closely related to us than to chimpanzees., hominin, A geographic trench in East Africa where many important fossils of early humans have been discovered., Olduvai Gorge, An extinct species of early human that lived in Africa, known for using simple stone tools., Homo habilis, An extinct species of human that was more advanced than Homo habilis, known for walking upright and using more complex tools., Homo erectus, middle stone age 8000 B.C. to 3000 B.C. Transition from hunter-gatherer societies to more settled communities., Mesolithic, A member of a nomadic group whose food supply depends on hunting animals and collecting plant foods such as fruits, nuts, and roots., hunter-gatherer, A person who moves from place to place without a permanent home, often in search of food, water, or grazing land., nomad, The movement of people from one region or place to another, often over long distances and in large groups., migration, the ability to walk on two legs, and it's a defining characteristic of human evolution, bipedalism, an early hominin that lived in Africa and walked upright, Australopithecus, a scientist who studies ancient human fossils and human development., paleoanthropologist, an important archaeological and fossil site in Tanzania where Louis and Mary Leakey made major discoveries., Great Rift Valley, a characteristic or behavior that helps an organism survive in its environment., adaptation, he discovered the most complete Australopithecus skeleton in 1974 and named it "Lucy", Don Johanson

Early Man

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