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Author Question: Which of the following gases is crucial to the existence of all forms of life? A) nitrogen B) ... (Read 21 times)

j.rubin

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on: Jul 14, 2018
Which of the following gases is crucial to the existence of all forms of life?
 
  A) nitrogen
  B) oxygen
  C) carbon dioxide
  D) argon

Question 2

The average length of time that individual molecules of a given substance remain in the atmosphere is called the:
 
  A) residence time.
  B) steady state.
  C) thermocline.
  D) travel time.


Madisongo23

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Reply #1 on: Jul 14, 2018
Answer to Question 1

Answer: B

Answer to Question 2

Answer: A


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