Final answer:
The microorganisms that reside in an animal for a short time without causing a disease are called transient microbiota.
Step-by-step explanation:
The microorganisms that are present in an animal for a short time without causing a disease, residing for days, weeks, or months, and then disappearing are called transient microbiota.
Transient microbiota refers to microorganisms that are only temporarily found in the human body. These microorganisms may include pathogenic microorganisms but do not cause disease in healthy hosts.
Hygiene and diet can alter both the resident and transient microbiota.