A population of beetles that includes both sandy and green individuals is introduced into a grassy environment. How do you expect the population to evolve due to natural selection? Now suppose that...

A population of beetles that includes both sandy and green individuals is introduced into a grassy environment. How do you expect the population to evolve due to natural selection? Now suppose that another beetle population lives in a nearby sandbank. Most of the individuals in this population are sandy colored. If beetles regularly migrate from one population to the other, what will be the effect on each population? Does gene flow make it easier or harder for these beetle populations to adapt to their environments?