Author Question: Which of the following gases was present in the smallest amounts in early atmosphere of the Earth? ... (Read 81 times)

sdfghj

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Which of the following gases was present in the smallest amounts in early atmosphere of the Earth?
 
  A) hydrogen (H2)
  B) nitrogen (N2)
  C) carbon dioxide (CO2)
  D) oxygen (O2)

Question 2

The rear-view mirrors on the passenger side of many new cars have a warning written on them: OBJECTS IN MIRROR ARE CLOSER THAN THEY APPEAR. This implies that the mirror must be
 
  A) concave.
  B) plane.
  C) convex.
  D) transparent.



dominiqueenicolee

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Answer to Question 1

D

Answer to Question 2

C



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