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Some animals feed on plants; other living things feed on the creatures that feed on plants.Via this food chain, the radioactive carbon that plants have absorbed from the air is transferred to other living things.The exact opposite of this situation may also arise.Under certain conditions, the amount of carbon-14 in the specimen to be dated can be released into the external environment in the form of carbonate and/or bicarbonate.
Thus the age of a once-living thing can be calculated by measuring the amount of carbon-14 left in its tissues. In other words, the amount of carbon-14 in the dead tissue declines by half once every 5.570 years.
Carbon-14 dating is regarded as giving accurate results for specimens between 10,000 and 60,000 years old.
Carbon-14 testing is one of the dating tests most frequently employed.
Radioactive carbon-14, a newly produced element, combines with oxygen in the atmosphere, forming another radioactive compound, C-14 O2.
As we know, plants use CO2 (carbon dioxide), H2O (water) and solar rays in order to produce their nutrients.
Other radiometric dating methods such as potassium-argon or rubidium-strontium are used for such purposes by those who believe that the earth is billions of years old.