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Biology/regarding organism age

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Question
How the scientists determine the age of fossils and organisms. Is carbon dating being used? I read the below news. Is that true?

http://www.americaherald.com/scientists-discover-2-5-billion-year-old-bacteria/2

Answer
www.ucmp.berkeley.edu/fosrec/McKinney.html

staff.concord.org/~btinker/GL/web/geology/english/dating...
www.nature.com/.../library/dating-rocks-and-fossils-using...

The radioactive technique of radiometric dating is used to determine the age of fossils.

Is carbon dating being used
arizonaruins.com/articles/radiocarbon.html
hyperphysics.phy-astr.gsu.edu/hbase/nuclear/cardat.html
acad.carleton.edu/.../bio302/Pages/CarbonDatingBack.html

hope this helps

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