Which of the following statements accurately describes the process of dating earth's history?
a. scientists use relative dating to determine the absolute age of a new fossil.
b. scientists use radioactive isotopes to determine the absolute age of a new fossil.
c. scientists use radiometric dating to determine the relative age of a new fossil.
d. scientists use index fossils to determine the specific years of age of a new fossil.

One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails. b. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. c. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails have other functions, because prokaryotes don't have nuclei.