Multiple choice From SMALLEST to LARGEST which is the order of microbe size? Bacteria - Viruses - Fungi Viruses - Bacteria - Fungi Bacteria - Fungi - Viruses Viruses - Fungi - Bacteria Reveal answer Fill a bubble to check yourself B Correct answer Explanation Viruses are the smallest, typically ranging from 20 to 300 nanometers. Bacteria are larger, usually in the micrometer range, and fungi are generally the largest of the three.