rate of genetic mutations survival benefit of specific genes pressure of selection on base pairs number of bases in species' genomes
I am hesitating between 4 options to answer the following question, which option should I choose?
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?
Possibilities:
- rate of genetic mutations
- survival benefit of specific genes
- pressure of selection on base pairs
- number of bases in species' genomes

rate of genetic mutations