The foregoing article was primarily based on a discussion of radiocarbon dating found in The Biblical Chronologist Volume 5, Number 1.
Animals (and humans) get their carbon atoms primarily from what they eat (i.e., plants).
All living organisms and our environment are made of carbon.
The most common form of carbon in the atmosphere is carbon-12, which is a stable isotope of carbon.
Once the organism dies, however, it ceases to absorb carbon-14, so that the amount of the radiocarbon in its tissues steadily decreases.
Carbon-14 has a half-life of 5,730 ± 40 years— during the succeeding 5,730 years.
Carbon-14 dating is a scientific technique to determine the age of archaeological objects of a biological origin.