Which of the following statements is best supported by information in the passage?
F. Water that has collected in endorheic basins is at least 21.0 million years old.
G. The age of fossilized plant species cannot be precisely estimated.
H. More water has collected in and evaporated from older salt pans.
J. Any endorheic basin that is less than 2.0 million years old contains no fossils.