Which is a "single-celled organism" that do not rely on a host

Organisms that reproduce quickly in moist, humid environments.

Which is SO small you can not see them unless you're using a Laboratory grade microscope?

Which can spread quickly through a population or group? i.e. passed from person to person through fluids in a cough or a sneeze

Which has the ability to mutate (change)?

Which can be seen with a standard sized microscope?

Reproduces quickly inside the body, making copies as they divide and split into two.

Can be passed relatively easily in saliva, mucus, or other body fluids , however, some can be good for you, such as in the lining of your digestive system

Yeasts or molds.

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