How is atmospheric nitrogen converted to a usable form in the ...

[bobypop]

How is atmospheric nitrogen converted to a usable form in the biosphere?
 
  A) Atmospheric nitrogen is directly available to plants and animals.
  B) Atmospheric nitrogen is completely unavailable to plants and animals and, as a result, synthetic fertilizers must be used.
  C) Bacteria within root nodules of legumes chemically combine the atmospheric nitrogen into nitrates and ammonia.
  D) It is absorbed into plants via stomata and converted within the plant to a usable form.

Question 2

Which of the following is the largest carbon sink?
 
  A) Fossil fuels and oil shales B) The atmosphere
  C) Dead organic matter D) The oceans

[mmpiza]

Answer to Question 1

C

Answer to Question 2

D

[bobypop]

Thanks for the timely response, appreciate it

[diana chang]

Gracias!