Answer:
when the red litmus paper is placed in a jar of ammonia, the red litmus paper turns into blue as ammonia gas is basic in nature. It confirms the alkalinity of the ammonia gas.
Dont know the first part but melanin quantities change the dkin color
Answer:
a single-replacement reaction replaces one element for another in a compound. A double-replacement reaction exchanges the cations, or the anions, of two ionic compounds.
A shared derived characteristics is usually a homologous structure, such as a backbone, that is shared by all organisms in a group.
