Aspecies of small lizard has three color forms, pale gray, brown, and black. in its original range, the colors of the rocky environment were mixed from pale gray to very dark, and the population had an even mix of all three color forms. the blending of colors with their environment the lizards hide from predators. a group of these lizards ended up on an island with all gray rocks. eventually, only gray lizards remained. this is an example of

Directional Selection

Explanation:

In population genetics, directional selection also know as positive selection is a mode of natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype

i think it is dna, i'm not totally sure but i think it might be.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands