In our natural atmosphere, A) there is very little hydrogen in ...

[lilldybug07]

In our natural atmosphere,
 
  A) there is very little hydrogen in any form.
  B) hydrogen is most abundant combined with oxygen as water vapor and other compounds.
  C) hydrogen is most abundant combined with carbon.
  D) hydrogen gas is more abundant than carbon dioxide.

Question 2

Using hydrogen to power a car is most analogous to using
 
  A) electricity stored in a battery.
  B) natural gas as a source of fuel.
  C) biogas as a source of fuel.
  D) gasoline as a source of fuel.

[bulacsom]

Answer to Question 1

B

Answer to Question 2

A