natural selection tends to increase differences as local populations are selected for the local environment.
(natural selection; tends; to increase differences as local populations are selected for the local environment) (natural selection; to increase; differences as local populations are selected for the local environment) (local populations; are selected; for the local environment)
natural selection natural selection local populations
tends to increase are selected
to increase differences as local populations are selected for the local environment
differences as local populations are selected for the local environment
for the local environment