The least abundant gas in out atmosphere is Carbon dioxide at 0.03%.
i wish i could tell you but i am not a scientist.
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It was the first civil war. Additionally, after the Civil War, 3 amendments were added to the Constitution that made it legal for the freedmen to vote. This allowed for new issues and a new movement to allow women to vote. After the civil war, segregation was implemented and that created the Civil Rights Movement to get rid of segregation. Hope this helps.
