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As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.
A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.
The current geologic period is called the _______ 19.
You probably have seen or read news stories about fascinating ancient artifacts.
Absolute dating provides a numerical age or range in contrast with relative dating which places events in order without any measure of the age between events.