Which of the Following Best Describes the Roles of Microorganisms

Question

Which of the following best describes the roles of microorganisms in the carbon cycle?
A) primary producers
B) heterotrophs
C) decomposers
D) heterotrophs and decomposers
E) primary producers, heterotrophs and decomposers

Accepted Answer

Microorganisms play a variety of roles in the carbon cycle. They act as primary producers (e.g., cyanobacteria and algae) by fixing carbon dioxide during photosynthesis. They also function as heterotrophs, consuming organic matter for energy, and as decomposers, breaking down dead organic material and releasing carbon dioxide back into the atmosphere. Therefore, they fulfill all three roles: primary producers, heterotrophs, and decomposers.