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Why is carbon used in dating once living things

If the shoes were made of leather once living animal it could be carbon dated, as could other parts that are made from previously live materials. Carbon dating requires the presence of carbon and carbon because these isotopes are radioactive. The long a once-living organism has been dead, the less radioactive it will be per gram of carbon. This gives us a way to determine the approximate age of once-living organisms. The results from 'shoes' would be rather inaccurate as the once living organism has been processed and that will interfere with the dating at least to some extent. Carbon dating looks at the decay of carbon atoms in organic material that has been preserved as a fossil.
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Archaeological Dating: Stratigraphy and Seriation

What is Carbon Dating? The age of archaeological specimens can be calculated by looking at the amount of carbon - 14 in a sample. The method is a form of radio dating called carbon dating. Radio dating can also be used to date rocks. How is Carbon - 14 formed? The isotope carbon - 14 is created at a constant rate in the upper atmosphere by cosmic rays acting on nitrogen.
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Importance of Carbon in Living Beings: 8 Reasons

Carbon dating is a variety of radioactive dating which is applicable only to matter which was once living and presumed to be in equilibrium with the atmosphere, taking in carbon dioxide from the air for photosynthesis. Cosmic ray protons blast nuclei in the upper atmosphere, producing neutrons which in turn bombard nitrogen, the major constituent of the atmosphere. This neutron bombardment produces the radioactive isotope carbon The radioactive carbon combines with oxygen to form carbon dioxide and is incorporated into the cycle of living things. The carbon forms at a rate which appears to be constant, so that by measuring the radioactive emissions from once-living matter and comparing its activity with the equilibrium level of living things, a measurement of the time elapsed can be made.
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Perhaps no concept in science is as misunderstood as "carbon dating. But, carbon dating can't be used to date either rocks or fossils. It is only useful for once-living things which still contain carbon, like flesh or bone or wood.
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