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Artifact selections benefits humans by helping us learn what had happened in the past.
A radioactive isotope decays at a constant rate proportional to the number of radioactive atoms remaining. A simple way of describing the speed of decay is to see the time it takes for half of the atoms of a radioactive parent to decay and form the daughter element(s). This is called the half life.
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Each human cell usually contains 23 pairs of chromosomes, 46 in total. The first 22 are the same in males and females and the 23rd set differ between males and females