(A) Agar is a gelatinous substance that is commercially obtained from certain species of marine red algae (Rhodophyceae),specifically $Gelidium$ and $

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(A) Agar is a gelatinous substance that is commercially obtained from certain species of marine red algae (Rhodophyceae),specifically $Gelidium$ and $Gracilaria$. It is widely used in laboratories as a culture medium for growing microorganisms and in the food industry as a thickening agent.