- Bacterium - Bug - Microbe - microscopic organism - minute life form - Source of infection - That which is to develop a new individual; as, the germ of a
fetus, of a plant or flower, and the like; the earliest form under
which an organism appears.
- An irregular shaped protozoan - Life in a cell - Life in a cell? - Microscopic one celled animal - One-celled animal - Primitive life form - Protozoan