The identification of a microorganism by colony morphology growth on selective media, Gram stains, or up to three tests is:

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Presumptive identification of a microorganism involves initial tests such as observing colony morphology, growth on selective media, and Gram staining. These methods provide preliminary information that suggests the identity of the microorganism but requires further testing for confirmation.

The Identification of a Microorganism by Colony Morphology Growth on Selective