What do all bacteria have in common?
They all have cell nuclei.
They're all multi-cellular organisms.
They're all single-celled organisms.
They can all be found inside the human body.

Explanation: There are three notable common traits of bacteria, 1) lack of membrane-bound organelles, 2) unicellular and 3) small (usually microscopic) size. Not all prokaryotes are bacteria, some are archaea, which although they share common physicals features to bacteria, are ancestrally different from bacteria.

i think it is dna, i'm not totally sure but i think it might be.