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Author Question: Average atmospheric CO2 concentrations have ____ over the past 100 years. A) slightly decreased B) ... (Read 108 times)

tfester

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on: Jul 13, 2018
Average atmospheric CO2 concentrations have ____ over the past 100 years.
 A) slightly decreased
  B) remained constant
  C) significantly decreased
  D) increased

Question 2

Carbon dioxide is removed from the atmosphere through the process of ____.
 A) fuel combustion
  B) respiration
  C) volcanic activity
  D) photosynthesis


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memslove

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Reply #1 on: Jul 13, 2018
Answer to Question 1

D

Answer to Question 2

D


tfester

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Reply 2 on: Jul 13, 2018
Thanks for the timely response, appreciate it

raili21

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Reply 3 on: Yesterday
Excellent

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