Final answer:
Transient microbiota are microorganisms that are only temporarily found in the human body, acquired by direct contact, and are present for a relatively short time.
Step-by-step explanation:
The term transient microbiota refers to microorganisms that are only temporarily found in the human body, and these may include pathogenic microorganisms. They are present for a relatively short time and differ from normal microbiota because they are acquired by direct contact. They can be acquired through activities such as shaking hands, touching contaminated surfaces, or through exposure to droplets from coughing or sneezing. However, transient microbiota do not necessarily cause diseases on their own.