Need assistance . I really don't want to fail :)

As our current atmosphere formed, the concentrations of various atmospheric gases fluctuated. match each gas with the explanation that best describes how its proportion changed during the evolution of the atmosphere.

Why were the articles of confederation replaced with the constitution? a. the articles of confederation did not vice strong power to the federal government. b. the articles of confederation did not create a government structure for the states. c. the articles of confederation did not provide powers for strong individual state governments. d. the articles of confederation did not allow the federal government to deal with foreign countries.

Me 10 ! who would most approve of the us economic system and why? adam smith john maynard keynes karl marx