SR71 writes:
(3)The population itself is evidence of a young planet. In 1810 the population was 1 billion. within less then 200 years the population grew to 6 billion. This meants that according the rate at which population grows at a certain rate according to poplation size. Through this study the earth can't even be a million years old.
If you use E. coli, you can 'prove' that the Earth cannot be more than a few days old.
If I remember my math results correctly, it would take something like 45 days for the offspring of 1 bacterium to out-mass the entire visible universe.