Answer: I think it's B
Explanation:
I think it might be B because of the one celled organisms. Let's just see what the others say tho. But yeah I think it's B.
I believe the answer to this is deposition of rock particles
The erythema response of skin to ultraviolet radiation (UVR), i.e., the sunburn reaction, has long been known to correlate with skin color. Dark-skinned individuals are able to tolerate a longer sun exposure than light-skinned individuals. Skin color in humans is mainly determined by the quantity, quality, and distribution of the complex biopolymer, mel~ni1_1, and its organized form, the melanosome (1,2}; melanm IS thought to protect skin from the deleterious effects of UVR.
Until a couple of decades ago, such trees were usually based on the morphologies of species. Since the development of genetic sequencing, however, that has
