Earth science multiple choice question

What role do bacteria play in the carbon cycle

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

Explain the significance of the increased cell specialization of the volvocine line