That is, they take up less than would be expected and so they test older than they really are.Furthermore, different types of plants discriminate differently.
Familiar to us as the black substance in charred wood, as diamonds, and the graphite in “lead” pencils, carbon comes in several forms, or isotopes.
One rare form has atoms that are 14 times as heavy as hydrogen atoms: carbon-14, or C ratio gets smaller.
Overall, the energy of the Earth's magnetic field has been decreasing, so more C is being produced now than in the past.
This will make old things look older than they really are.
It does not give dates of millions of years and when corrected properly fits well with the biblical flood.