Microscopic scale

observed with the eye. Such groups include the Cladocera, planktonic green algae of which Volvox is readily observable, and the protozoa of which Stentor can be easily seen without aid. The term submicroscopic is a similar term used to describe objects that are too small to see with any optical microscope.
Microscopic is also by association used to classify and describe the units and measurements relevant to very small objects. The antonym to microscopic is macroscopic
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natural dog food diet
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