Bacteria Bacteria Bacteria lack organelle, like nuclei or chloroplasts. There are two kingdoms, Archaebacteria and Eubacteria. Archaebacteria include prokaryotes that live in anerobic environments. Both Eubacteria and eukaryotes probally diverged from Archaebacteria.
Most bacteria are heterotrophic, and serve as decomposers.
By decomposing dead organic matter, they release nutrients.