Other corrections must be made to account for the proportion of throughout the biosphere (reservoir effects).
Dating as an institution is a relatively recent phenomenon which has mainly emerged in the last few centuries.
From the standpoint of anthropology and sociology, dating is linked with other institutions such as marriage and the family which have also been changing rapidly and which have been subject to many forces, including advances in technology and medicine.
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Research has been ongoing since the 1960s to determine what the proportion of in the atmosphere has been over the past fifty thousand years.