The five smallest life-forms

Before the 18th century, it was believed that there was a magical power in the world that could turn fruit juice into wine or make a healthy person sick or even die within a few days. It wasn’t until Antony van Leeuwenhoek used a homemade microscope to observe some “small creatures” in the rain that people became interested in these little creatures. These little creatures are what we now call microbes.

According to the widely accepted classification, microorganisms can be divided into five categories: bacteria, fungi, viruses, protozoa, and algae. The following is a brief introduction to the characteristics of these five categories of microorganisms and their roles in daily human life.

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