In the atmosphere, carbon dioxide is found in two forms, i.e., `.^(12)CO_(2)` and `.^(14)CO_(2)`. Plants absorb `CO_(2)` during photosynthesis. In presence of chlorophyll, plants synthesise glucose. `6 CO_(2) + 6 H_(2) O to overset(hv)(to) C_(6)H_(12)O_(6) + 6O_(2) uarr` Half life of `.^(14)C` is 5760 years. The analysis of wooden artifacts for `.^(14)C` and `.^(12)C` gives useful information for deermination of its age. all living organisms, because of their constant exchange of `CO_(2)` with the surrounding have the same ratio of `.^(14)C` to `.^(12)C`, i.e., `1.3 xx 10^(-12)`. When an organism dies, the `.^(14)C` in it keeps on decaying as follows: `._(6)^(14)C to ._(7)^(14)N + ._(-1)^(0)e` + Energy Thus, the ratio `.^(14)C//^(12)C` decrease with the passage of time. we can be used to date anything made of organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating material have been dated to about 50,000 years with accuracy. `.^(14)C` exists in atmosphere due toA. conversion of `.^(12)C` to `.^(14)C`B. Combustion of fossil fuelC. bombardement of atmosphere nitrogen by cosmic ray neutronsD. none of the above