Answer:
However, except virus, all others form colonies, that consists of millions of cell aggregates in a relatively small space. They are visible as clusters of many many cells, but not as independent units.
By viewing under ordinary microscope ( 100 magnification), you can visualize the cells of molds.
Step-by-step explanation:
The eye's the limit (except in one case). Yes. Most bacteria are too small to be seen without a microscope, but in 1999 scientists working off the coast of Namibia discovered a bacterium called Thiomargarita namibiensis (sulfur pearl of Namibia) whose individual cells can grow up to 0.75mm wide.