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They used pottery and other materials in sites to date 'relatively'.

They thought that sites which had the same kinds of pots and tools would be the same age.

During the period of a plant's life, the plant is taking in carbon dioxide through photosynthesis, which is how the plant makes energy and grows.

Animals eat plants, and some eat other animals in the food chain.

The archaeologist Colin Renfrew (1973) called it the development of this dating method 'the radiocarbon revolution' in describing its great impact upon the human sciences.

The radiocarbon method was developed by a team of scientists led by the late Professor Willard F.

Libby of the University of Chicago after the end of World War 2.

You can work out that after about 50 000 years of time, all the radiocarbon will have gone.

Therefore, radiocarbon dating is not able to date anything older than 60 or 70 000 years old.

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