The increase in atmospheric carbon dioxide 3.5 billion years ago would have likely been contributed to by
A. early cells beginning the process of photosynthesis and producing sugars.
B. early cells using hydrogen sulfide in the formation of biomolecules.
C. increasing colonies of cyanobacteria undergoing photosynthesis.
D. early cells undergoing anaerobic lactic acid fermentation.

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Ican't see the images : ( 

Succulents are the type of plant. like a cactus.