In a species of snail, dark-shelled individuals are better hidden from bird predators in the shady forest, while light-shelled individuals are better hidden in well-lit brushy edge areas. If there were no areas of intermediate brightness in this habitat, which type of selection would act on shell color in these snails? a stabilizing selection b. directional selection c. disruptive selection

c. disruptive selection

Explanation:

Disruptive selection, which is also called diversifying selection, is a form of natural selection that causes individuals with intermediate trait to be less favored to survive and reproduce, while those with extreme traits are favored by the evolutionary forces, making them to survive and reproduce more.

Disruptive selection would act on shell color in the snails causing the alleles for the extreme traits to increase in frequency while that of intermediate values will decrease resulting in the population being divided mainly into two groups.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.