The correct answer is all of these.
There are variety of eubacteria present in the environment.
They are available in the form of decomposers that helps in cleaning the environment and recycling the nutrients back into the soil.
Heterotropic bacteria are also present that feed on the food made by the producers.
Eubacteria are also pathogenic in nature that can be infectious to cause disease.
Autotropic Eubacteria are the producers that make food by the process of photosynthesis.
