NURSING ANM AND GNM

Detailed explanation-1: -Our analyses support an ancient (late Paleoproterozoic) origin of photosynthetic eukaryotes with the primary endosymbiosis that gave rise to the first alga having occurred after the split of the Plantae (i.e., red, green, and glaucophyte algae plus land plants) from the opisthokonts sometime before 1, 558 MYA.

Detailed explanation-2: -So, the correct answer is ‘Cyanobacteria’.

Detailed explanation-3: -The earliest widely accepted fossil evidence of photosynthetic eukaryotes is Bangiomorpha, a red alga deposited ∼1.1 billion y ago (Bya) (12).

Detailed explanation-4: -Overwhelming evidence indicates that eukaryotic photosynthesis originated from endosymbiosis of cyanobacterial-like organisms, which ultimately became chloroplasts (Margulis, 1992). So the evolutionary origin of photosynthesis is to be found in the bacterial domain.