Asked by Mila

In living things, what is the source of the carbon-14 that is used in radiocarbon dating?

A. Carbon dioxide in rocks
B. Carbonic acid in caves
C. Carbon dioxide in the atmosphere
D. Carbon dioxide in water
Answered by Ms. Sue
"The primary natural source of carbon-14 on Earth is cosmic ray action on nitrogen in the atmosphere, and it is therefore a cosmogenic nuclide."
Carbon-14 - Wikipedia
Answered by Christian ChimChim
Isn't Wikipedia untrustworthy??
Answered by Ms. Sue
No. I would, of course, get other opinions on a controversial subject -- but Wikipedia is right on scientific and historical questions. No one has any motivation to change anything that is not controversial.

However -- feel free to use another source.
Answered by Among us sussy
Give me six water, six carbon dioxide. . . I take that and look what I do on the inside. Sunlight as my engine, I can’t wait to taste The glucose I make, chuck six oxygen as waste. I’m the chloroplast. Photosynthesis is my task. It’s a blast and I’m jazzed. Why’d I tell you? ‘cause you asked
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