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The stable form of carbon is carbon 12 and the radioactive isotope carbon 14 decays over time into nitrogen 14 and other particles.
Carbon is naturally in all living organisms and is replenished in the tissues by eating other organisms or by breathing air that contains carbon.
It goes against human nature to challenge long held ideas of truth.
Some layers contain mostly fish fossils while others contain land-dwelling creatures such as dinosaurs.
Since each of these layers seems so specialized it is easy to conclude that one type of creature gave rise to the next type of creature over the course of whatever time it took to form the various layers between them.
In this interactive, learn how radiocarbon dating works, what it takes to determine a date in the lab, and why it's challenging to pinpoint a date precisely.
There are many important fossil sites across Canada.
At any particular time all living organisms have approximately the same ratio of carbon 12 to carbon 14 in their tissues.