The most important source of the free oxygen in our atmosphere ...

[amal]

The most important source of the free oxygen in our atmosphere is:
 
  A) green plants that carry on photosynthesis.
  B) the dissociation of water vapor in the upper atmosphere.
  C) deforestation.
  D) volcanic degassing.

Question 2

Students at MIT developed a method to produce ________ from agricultural wastes, resulting in a safer indoor fuel for use in developing countries.
 
  A) ethanol B) biodiesel C) fuel cells D) wood E) charcoal

[ong527]

Answer to Question 1

A

Answer to Question 2

E

[amal]

Thank you

[ong527]

Happy to help you