When a culture has a language/(s), the main language may have a dialect- which is when a few words or phrases do not sound the same as the original language, but nevertheless is identified as that languge. Eg. The german language has a dialect called schwerig- which sound almost the same but a few words and phrases are different
Precise time of an element's radioactive decay can be studied with the help of amount of Carbon on the body. By measuring and comparing the amount of Carbon on the body, Scientists interpret, & can calculate the actual age of an object
Hope this helps!