rate of genetic mutations survival benefit of specific genes pressure of selection on base pairs number of bases in species' genomes
I gave my students this multiple choice question: Scientists are able to correlate time and the amount of difference between homologous genes when studying the divergence of two species because scientists have reliable estimates for which value?

Only one answer is correct among these 4 choices:
- rate of genetic mutations
- survival benefit of specific genes
- pressure of selection on base pairs
- number of bases in species' genomes

Could you tell me which one is correct?

rate of genetic mutations