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Fossils are remnants or imprints of organisms that existed in the pre-historic periods. Contrary to what is portrayed in popular media, fossils are not limited to dinosaurs and their bones. In fact, the oldest fossils on record are microfossils of bacteria that existed 3.5 BILLION years ago. This time span falls within the Eoarchean era (the 4th era of the Archean eon) which covers a time span stretching to 4 to 3.6 billion years ago.
Here is some more information on fossils and determining their age:
https://brainly.ph/question/259350