Autotrophic organisms can transform themselves from inorganic substances into organic substances for utilization.

Heterotrophs is utilized by absorbing ready-made organic matter from the outside.

Prokaryotes are a kind of organisms composed of prokaryotic cells, including cyanobacteria, bacteria, archaea, actinomycetes, rickettsia, spirochetes, mycoplasma, chlamydia and so on.

Photoautotrophic type generally refers to photosynthesis and chemoautotrophic type, that is, inorganic substances are converted into organic substances by using the energy released by chemical reactions.

Cyanobacteria convert inorganic carbon sources, usually carbon dioxide, into organic matter through photosynthesis.

There are nitrifying bacteria, sulfur bacteria, iron bacteria, hydrogen bacteria and so on.

Most bacteria, actinomycetes and mycoplasma are heterotrophic.