Parts of the atmosphere are identified primarily by their?

Nitrogen — 78 percent.Oxygen — 21 percent.Argon — 0.93 percent.Carbon dioxide — 0.04 percent.Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor.

Explanation:

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It is useful for historians to write narratives so that history can be passed on from their point of view.  think about a story being told in third person, then think about it again being told in first person, by someone who actually experienced the event.

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