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    Measure isotopes for radiometric dating

    The radiocarbon dating method is based on the fact that radiocarbon is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen.The resulting radiocarbon combines with atmospheric oxygen to form radioactive carbon dioxide, which is incorporated into plants by photosynthesis; animals then acquire in a sample from a dead plant or animal such as a piece of wood or a fragment of bone provides information that can be used to calculate when the animal or plant died.

    By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.

    The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.

    Libby received the Nobel Prize in Chemistry for his work in 1960.

    Other critics, perhaps more familiar with the data, question certain aspects of the quality of the fossil record and of its dating.

    These skeptics do not provide scientific evidence for their views.

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