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Paleontology is the study of the history of life on Earth as based on fossils. Fossils are the remains of plants, animals, fungi, bacteria, and single-celled living things that have been replaced by rock material or impressions of organisms preserved in rock. Paleontology lies on the border between biology and geology, but differs from archaeology in that it excludes the study of anatomically modern humans. The term itself originates from Greek παλαιός ("old, ancient"), ὄν ("being, creature") and λόγος, ("speech, thought, study").