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The skeleton displays traits that place it firmly as the first baleen-whale relative known to emerge after an ancient group of whale ancestors called basilosaurids split into two: one branch led to the toothed whales, which include sperm whales (Physeter macrocephalus) and dolphins, and the other to baleen whales. Whale fossils from this time period can answer a lot of questions that researchers have about the origins of living whale lineages, he says.Researchers reported their findings on 11 May in Current Biology (O. They include the appearance of the earliest baleen whale ancestors.Here he had deposited his travelling chest in the house of a relative.There lay your relative on his back behind the curtain, plunged in sweet slumber. Students not only want to know how old a fossil is, but they want to know how that age was determined.Some very straightforward principles are used to determine the age of fossils.2) To familiarize students with the concept of half-life in radioactive decay.3) To have students see that individual runs of statistical processes are less predictable than the average of many runs (or that runs with relatively small numbers involved are less dependable than runs with many numbers).

of referre "to refer." Meaning "person in the same family" first recorded 1657; the adj. Relatively "in relation to something else" is recorded from 1561.

In archaeology, seriation is a relative dating method in which assemblages or artifacts from numerous sites, in the same culture, are placed in chronological order.

Where absolute dating methods, such as carbon dating, cannot be applied, archaeologists have to use relative dating methods to date archaeological finds and features.

A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.

However, by itself a fossil has little meaning unless it is placed within some context.

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