Why Are Microorganisms Like Fungi, Bacteria, and Archaeons So Important

Multiple Choice

Why are microorganisms like fungi, bacteria, and archaeons so important to the carbon cycle?

A) These microorganisms generate the oxygen necessary for aerobic organisms.
B) Many of these microorganisms generate carbon dioxide, making it available for primary producers.
C) These microorganisms form their own portion of the carbon cycle in case other areas of the carbon cycle fail.
D) These microorganisms bridge the carbon cycle between terrestrial and marine environments.