"Microscopic organisms" refers to very tiny living things that cannot be seen with the naked eye, such as bacteria, viruses, or algae.
Sentences with «microscopic organisms»
The human body is host to a number of microscopic organisms, such as parasites and mites. (creditdonkey.com)
I like to think we can apply this same logic to many other things, including a belief that we evolved on this planet from microscopic organisms. (religion.blogs.cnn.com)
This is very unfortunate, seeing as bacteria, fungi, and other microscopic organisms that live «in» and on our bodies have a profound impact on our health. (darwinian-medicine.com)