Why is e coli classified as a bacteria?

E. coli is classified as a bacterium because it is a single-celled prokaryotic organism that lacks a nucleus and other membrane-bound organelles, which are characteristic features of eukaryotic cells. It belongs to the domain Bacteria and the phylum Proteobacteria. E. coli has a simple structure, reproduces asexually through binary fission, and is capable of living in various environments, including the intestines of humans and animals. Its classification is based on its genetic, biochemical, and morphological characteristics.