in real-life, does the amount of carbon-14 reach zero? pls explain as well...?

Answer 1

If you mean does carbon-14 ever reach zero levels in living things, the answer is, no. Carbon-14 is created in the atmosphere by cosmic rays creating neutrons that react with nitrogen. Plants absorb this carbon-14 and it is passed on to all organisms that consume plants, the level of carbon-14 will remain constant as it is continually taken in by organisms. Only after death does the carbon-14 begin to decay, it has a half life of 5,600 years and can date the time of death back to 30,000 years with good accuracy.

Answer 2

Carbon 14 absorption has been observed to increase with time.