Answer:
Lipids within the sebum react with air, resulting in chemical oxidation and the formation of the black color.
Explanation:
This is the answer. I hope it helps you out.
I would say B. Hypertonic solution because it causes the water to leave the cell by the osmosis.
38: Is Primary Producers
39: Is 9,990
40: Is Fungus
41: Is A
42: Is A
Articulations.
Stay safe!!