Bacteria Bacteria are tiny, single-celled organisms that live in the body.
Here you find articles in the encyclopedia about single-celled organisms.
In the oceans around Antarctica, carbon uptake is carried out by minute single-celled algae.
In order to cause the disease, the single-celled parasite must multiply in the human bloodstream.
Everyone knows humans evolved from apes which, in turn, ultimately evolved from apes which, in turn, ultimately evolved from single-celled life forms.