Answer:
A paleontology student plants to compare the genome of the organism and know the recent common ancestor.
The problem that is associated with the question is that the fossils has now been converted into minerals and rocks which has no genetic content in it.
The fossils can be studied only when the fossils has not be completely replaced by minerals. So, the point which has to be point out is that the genetic content cannot be studied when the fossils has been converted in the form of rocks.