(C) Viroids are infectious agents that are smaller than viruses. They consist solely of a short strand of circular,single-stranded $RNA$ without a pro

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(C) Viroids are infectious agents that are smaller than viruses. They consist solely of a short strand of circular,single-stranded $RNA$ without a protein coat (capsid). In contrast,viruses consist of genetic material ($DNA$ or $RNA$) enclosed within a protein coat. Therefore,viroids are the smallest known infectious agents.