Answer:
Chemical bonds include covalent, polar covalent, and ionic bonds. Atoms with relatively similar electronegativities share electrons between them and are connected by covalent bonds. Atoms with large differences in electronegativity transfer electrons to form ions. The ions then are attracted to each other.
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Answer:
Lipids within the sebum react with air, resulting in chemical oxidation and the formation of the black color.
Explanation:
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<span>Catalase is a common antioxidant enzyme which is produced naturally in almost all living organisms. </span>