Of the four gases CO2, H2O, N2, and O2, which are greenhouse ...

[NClaborn]

Of the four gases CO2, H2O, N2, and O2, which are greenhouse gases?
 
  A) CO2 and H2O
  B) all except O2
  C) only CO2
  D) all four
  E) CO2 and N2

Question 2

Which of the following statements about the greenhouse effect is true?
 
  A) The burning of fossil fuels increases the greenhouse effect on Earth because of the release of carbon dioxide.
  B) A weak greenhouse effect operates on Mars.
  C) Without the naturally occurring greenhouse effect, Earth would be too cold to have liquid oceans.
  D) One result of an increased greenhouse effect on Earth may be an increased number of severe storms.
  E) All of the above are true.

[jgranad15]

Answer to Question 1

A

Answer to Question 2

E

[NClaborn]

Excellent

[sailorcrescent]

Gracias!