Bacteria are the smallest micro-organisms, ranging from between 0.0001 and 0.001mm in size. Phytoplankton and protozoa range from about 0.001mm to about 0.25mm. The largest phytoplankton and protozoa can be seen with the naked eye, but most can only been seen under a microscope.
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Answer:
Bacteria are the smallest micro-organisms, ranging from between 0.0001 and 0.001mm in size. Phytoplankton and protozoa range from about 0.001mm to about 0.25mm. The largest phytoplankton and protozoa can be seen with the naked eye, but most can only been seen under a microscope.