Which of the following would violate the assumptions of the molecular clock?
A. comparison of genes for homologous structures across many species
B. assuming that organisms in competitive environments have the same rate of mutation as those in noncompetitive environments
C. comparison of genes of a species that lives deep in the ocean with relatives that live on the surface and are exposed to strong mutation-inducing ultraviolet radiation
D. comparison of many genes in many species of insects that undergo metamorphosis
