Final answer:
MSA is both selective and differential in nature, aiding in the growth of specific microorganisms and differentiating between them.
Explanation:
Mannitol salt agar (MSA) is both selective and differential. Selective means it only allows certain microorganisms to grow, while differential means it shows characteristics of the microorganisms growing on it. MSA is selective for staphylococci due to high salt concentration and differentiates based on the ability to ferment mannitol.
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