What organism usually fixes nitrogen into usable chemical forms? ...

[Melani1276]

What organism usually fixes nitrogen into usable chemical forms?
  a. Archaea
  b. Extremophiles
  c. Cyanobacteria
  d. Dinoflagellates

Question 2

What is a heterotroph?
  a. An organism that creates its own food
  b. An organism that eat other organism
  c. An organism the conducts chemosynthesis
  d. An organism that remains plankton for its entire life

[tdewitt]

Answer to Question 1

ANS: C
Bacteria and Cyanobacteria usually fix nitrogen. Nitrogen is often a limiting factor in the ocean.
Information can be found in the section Elements Cycle between Living Organisms and Their
Surroundings.

Answer to Question 2

ANS: B
A heterotrophy must consume food to obtain energy and nutrients. Some consume autotrophs while
others consume other heterotrophs. Information can be found in the section Primary Productivity Is the
Synthesis of Organic Materials

[Melani1276]

Thanks for the timely response, appreciate it

[Dnite]

Wow, this really help