evidence for evolution relative and radioactive dating

This updated method, 40 Ar- 39 Ar dating, requires only one sample and uses a single measurement of argon isotopes. Critically, to use this dating method the sample must be organic — it must contain carbon and have once been alive. Letter c in the picture indicates the undeveloped hind legs of a baleen whale. Fossils are always composed of actual tissue from extinct organisms. The fossil record was one of the early sources of data underlying the study of evolution and continues to be relevant to the history of life on Earth. Estimates of dates of domestication based upon the archeological record differ enormously from those based on genetic analysis for almost all crops and livestock. After all, an awful lot of assumptions hang on them.

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