Which of the following is true concerning the use and basis of molecular clocks in investigating the date of human/chimp divergence from a common ancestor?
1) Molecular clocks are based on the assumption that DNA mutations occur at a constant rate over time.
2) Molecular clocks can accurately determine the exact date of human/chimp divergence.
3) Molecular clocks rely on fossil evidence to estimate the date of human/chimp divergence.
4) Molecular clocks are only applicable to primate species.
