Transient microbiota differ from normal microbiota in that transient microbiota

a. cause diseases
b. are found in a certain location on the host
c. are acquired by direct contact
d. are present for a relatively short time

A - cause diseases

Explanation:

Transient microbiota are not always present and do not normally live or reproduce in or on a human body - so when they do, they are pathogenic and cause disease.

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