Final answer:
B), Transient microbiota are temporary microorganisms in the human body, differing from the resident microbiota that live constantly in or on our bodies as part of the human microbiome.
Step-by-step explanation:
The term transient microbiota refers to microorganisms that are only temporarily found in the human body. These microbes can include pathogenic microorganisms and their composition can be altered by factors such as hygiene and diet. Transient microbiota is different from the resident microbiota, which consists of organisms that live constantly in or on our bodies. The human microbiome, which is the total of all microorganisms and their genetic material associated with a person, plays a vital role in health and disease. Resident microbiota contributes to health by occupying niches that might otherwise be taken by pathogens, whereas transient microbiota can sometimes include harmful organisms.