Discussion
During the evolution of life, the first formed photosynthetic organisms were :
Answer: B
The first photosynthetic organisms among those listed were cyanobacteria.
Cyanobacteria are prokaryotes that carried out oxygen-releasing photosynthesis long before eukaryotes existed; their mats built the fossil stromatolites, and their oxygen eventually changed the atmosphere.
Algae are eukaryotes, which arose much later (their chloroplasts are themselves derived from engulfed cyanobacteria). Mycoplasmas are wall-less parasitic bacteria that do not photosynthesise, and bryophytes are land plants, among the last of the four to appear.
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