Answer:
an acid
Explanation:
Hydrochloric acid or muriatic acid is a colorless inorganic chemical system with the formula HCl. Hydrochloric acid has a distinctive pungent smell. It is classified as strongly acidic and can attack the skin over a wide composition range, since the hydrogen chloride completely dissociates in an aqueous solution. Wikipedia
It is the horizon layer
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There would need to be 120 drops of blood to fill a tube that can hold 6 mL.