Question

In plants and animals, the ratio of C${}^{14}$ to C${}^{12}$ is _______.

Answer 1

$1:1.35\times {10}^{-12}$

Animals including humans consume plants a lot thus tend to have the same ratio of carbon 14 to carbon 12 atoms. The ratio of carbon 14 to carbon 12 in living organisms is $1:1.35\times {10}^{-12}$.