Melanin provides pigmentation to the skin and it also provides UV ray protection (which is its role in the epidermis).
Answer: The noble gases are a group of chemical elements that make up Group 18 on the periodic table. These gases all have similar properties under standard conditions: they are all odorless, colorless, monatomic gases with very low chemical reactivity.
Answer: Most rocks contain SiO2 (silica), which is a compound of silicon and oxygen that forms 74%
