What is the best technique for determining the evolutionary relationships among closely related species that still have living members?
a
DNA or RNA analysis
b
homologous structure analysis
c
comparative embryology
d
comparative anatomy
a. DNA or RNA analysis
DNA or RNA analysis is the most effective technique for determining evolutionary relationships among closely related species that still have living members. By comparing the genetic material of different species, scientists can track similarities and differences to determine how closely related they are and how they have evolved over time. This method provides more precise and concrete evidence than other techniques such as homologous structure analysis, comparative embryology, or comparative anatomy.