Half-life is the amount of time it takes for half of the parent isotopes to decay. In another 5,730 years, the organism will lose another half of the remaining C-14 isotopes.
This will be covered in the chapters, Primitive Environment (chapter 9), and DNA (chapter 10).
Third, evolution of living organisms into more advanced life forms by natural selection or mutations.
Fossils are collected along with rocks that occur from the same strata.
These samples are carefully cataloged and analyzed with a mass spectrometer.
This technique relies on the property of half-life.