Respuesta :

Cyanobacteria, which are blue-green algae, belong to the eubacterial class. Prokaryotes can be autotrophs or heterotrophs. Autotrophs like blue-green algae can make their own food, 

Answer:

Cyanobacteria.

Explanation:

Cyanobacteria are simple, prokaryotic organisms that belong to kingdom Eubacteria. These bacteria are able to perform photosynthesis to get their energy and to produce oxygen.

They are also known as blue-green algae, due to their color. They are most primitive photosynthetic organisms.

Thus, the correct answer is 'cyanobacteria.'

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