Which of the following are classified as eubacteria?

Cyanophytes, also known as blue-green algae, are classified as eubacteria due to their distinct characteristics that align them with the broader classification of prokaryotic organisms. Eubacteria are categorized as "true bacteria," and cyanophytes exhibit traits typical of this group, such as simple cellular structures and a lack of membrane-bound organelles. They are important in various ecosystems as primary producers capable of photosynthesis, similar to plants.

Cyanophytes possess chlorophyll and other pigments that allow them to perform photosynthesis, differentiating them from other groups of bacteria that do not carry out this function. Moreover, their cell wall composition and genetic makeup are consistent with that of eubacterial organisms, further substantiating their classification.

In contrast, the other groups mentioned, such as Rickettsiae, Vibrios, and Mycoplasmas, include pathogens and bacteria with specific features that do not fall within the traditional classification of eubacteria, which is characterized by certain structural and functional traits.